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Search for a pentaquark state decaying into $pJ/ψ$ in $Υ(1,2S)$ inclusive decays at Belle
Authors:
Belle Collaboration,
X. Dong,
H. Y. Zhang,
X. L. Wang,
I. Adachi,
J. K. Ahn,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
R. Ayad,
S. Bahinipati,
Sw. Banerjee,
M. Bessner,
V. Bhardwaj,
D. Biswas,
D. Bodrov,
A. Bozek,
M. Bračko,
P. Branchini,
T. E. Browder,
A. Budano,
M. Campajola,
D. Červenkov,
M. -C. Chang
, et al. (139 additional authors not shown)
Abstract:
Using the data samples of 102 million $Υ(1S)$ and 158 million $Υ(2S)$ events collected by the Belle detector, we search for a pentaquark state in the $pJ/ψ$ final state from $Υ(1,2S)$ inclusive decays. Here, the charge-conjugate $\bar{p}J/ψ$ is included. We observe clear $pJ/ψ$ production in $Υ(1,2S)$ decays and measure the branching fractions to be…
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Using the data samples of 102 million $Υ(1S)$ and 158 million $Υ(2S)$ events collected by the Belle detector, we search for a pentaquark state in the $pJ/ψ$ final state from $Υ(1,2S)$ inclusive decays. Here, the charge-conjugate $\bar{p}J/ψ$ is included. We observe clear $pJ/ψ$ production in $Υ(1,2S)$ decays and measure the branching fractions to be $\mathcal{B}[Υ(1S) \to pJ/ψ+ anything] = [4.27 \pm 0.16(stat.) \pm 0.20(syst.)] \times 10^{-5}$ and $\mathcal{B}[Υ(2S) \to pJ/ψ+ anything] = [3.59 \pm 0.14(stat.) \pm 0.16(syst.)] \times 10^{-5}$. We also measure the cross section of inclusive $pJ/ψ$ production in $e^+e^-$ annihilation to be $σ(e^+e^- \to pJ/ψ+ anything) = [57.5 \pm 2.1 (stat.) \pm 2.5(syst.)]$~fb at $\sqrt{s} = 10.52~\hbox{GeV}$ using an 89.5~fb$^{-1}$ continuum data sample. There is no significant $P_c(4312)^+$, $P_c(4440)^+$ or $P_c(4457)^+$ signal found in the $pJ/ψ$ final states in $Υ(1,2S)$ inclusive decays. We determine the upper limits of $\mathcal{B}[Υ(1,2S)\to P_c^{+} + anything] \cdot \mathcal{B}(P_c^{+}\to pJ/ψ)$ to be at the $10^{-6}$ level.
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Submitted 11 March, 2024; v1 submitted 7 March, 2024;
originally announced March 2024.
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Search for a $μ^+μ^-$ resonance in four-muon final states at Belle II
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
V. Aushev,
M. Aversano,
R. Ayad,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
A. Baur,
A. Beaubien,
F. Becherer
, et al. (379 additional authors not shown)
Abstract:
We report on a search for a resonance $X$ decaying to a pair of muons in $e^{+}e^{-}\rightarrow μ^+ μ^- X$ events in the 0.212-9.000 GeV/$c^{2}$ mass range, using 178 fb$^{-1}$ of data collected by the BelleII experiment at the SuperKEKB collider at a center of mass energy of 10.58 GeV. The analysis probes two different models of $X$ beyond the standard model: a $Z^{\prime}$ vector boson in the…
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We report on a search for a resonance $X$ decaying to a pair of muons in $e^{+}e^{-}\rightarrow μ^+ μ^- X$ events in the 0.212-9.000 GeV/$c^{2}$ mass range, using 178 fb$^{-1}$ of data collected by the BelleII experiment at the SuperKEKB collider at a center of mass energy of 10.58 GeV. The analysis probes two different models of $X$ beyond the standard model: a $Z^{\prime}$ vector boson in the $L_μ-L_τ$ model and a muonphilic scalar. We observe no evidence for a signal and set exclusion limits at the 90\% confidence level on the products of cross section and branching fraction for these processes, ranging from 0.046 fb to 0.97 fb for the $L_μ-L_τ$ model and from 0.055 fb to 1.3 fb for the muonphilic scalar model. For masses below 6 GeV/$c^{2}$, the corresponding constraints on the couplings of these processes to the standard model range from 0.0008 to 0.039 for the $L_μ-L_τ$ model and from 0.0018 to 0.040 for the muonphilic scalar model. These are the first constraints on the muonphilic scalar from a dedicated search.
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Submitted 5 March, 2024;
originally announced March 2024.
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Measurement of $CP$ asymmetries in $B^0 \rightarrow K^0_S K^0_S K^0_S$ decays at Belle II
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
R. Ayad,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien
, et al. (428 additional authors not shown)
Abstract:
We report a measurement of decay-time dependent charge-parity ($CP$) asymmetries in $B^0 \rightarrow K^0_S K^0_S K^0_S$ decays. We use $387 \times 10^6 B\bar{B}$ pairs collected at the $Υ(4S)$ resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the $CP$-violating parameters $S$ and $C$ from a fit to the di…
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We report a measurement of decay-time dependent charge-parity ($CP$) asymmetries in $B^0 \rightarrow K^0_S K^0_S K^0_S$ decays. We use $387 \times 10^6 B\bar{B}$ pairs collected at the $Υ(4S)$ resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the $CP$-violating parameters $S$ and $C$ from a fit to the distribution of the decay-time difference between the two $B$ mesons. The resulting confidence region is consistent with previous measurements in $B^0 \rightarrow K^0_S K^0_S K^0_S$ and $B^0 \rightarrow (c\bar{c})K^0$ decays, and with predictions based on the standard model.
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Submitted 4 March, 2024;
originally announced March 2024.
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Cross talk of a large-scale depleted monolithic active pixel sensor (DMAPS) in 180 nm CMOS technology
Authors:
Lars Schall,
Christian Bespin,
Ivan Caicedo,
Jochen Dingfelder,
Tomasz Hemperek,
Toko Hirono,
Fabian Hügging,
Hans Krüger,
Konstantinos Moustakas,
Heinz Pernegger,
Petra Riedler,
Walter Snoeys,
Norbert Wermes,
Sinuo Zhang
Abstract:
Monolithic pixel detectors combine readout electronics and sensor in a single entity of silicon, which simplifies the production procedure and lowers the material budget compared to conventional hybrid pixel detector concepts. Benefiting from the advances in commercial CMOS processes towards large biasing voltage capabilities and the increasing availability of high-resistivity substrates, depleted…
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Monolithic pixel detectors combine readout electronics and sensor in a single entity of silicon, which simplifies the production procedure and lowers the material budget compared to conventional hybrid pixel detector concepts. Benefiting from the advances in commercial CMOS processes towards large biasing voltage capabilities and the increasing availability of high-resistivity substrates, depleted monolithic active pixel sensors (DMAPS) are able to cope with the high-rate and high-radiation environments faced in modern high-energy physics experiments. TJ-Monopix2 is the latest iteration of a DMAPS development line designed in 180 nm TowerSemicondutor technology, which features a large scale (2 x 2) cm$^2$ chip divided into (512 x 512) pixels with a pitch of (33 x 33) um$^2$. All in-pixel electronics are separated from its small collection electrode and process modifications are implemented to improve charge collection efficiency especially after irradiation. The latest laboratory measurements and investigations of a threshold variation observed for TJ-Monopix2 in typical operating conditions are presented.
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Submitted 19 February, 2024;
originally announced February 2024.
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Measurement of $CP$ asymmetries in $B^0\toη'K^0_s$ decays at Belle II
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
A. Baur,
A. Beaubien,
F. Becherer,
J. Becker,
J. V. Bennett
, et al. (377 additional authors not shown)
Abstract:
We describe a measurement of charge-parity ($CP$) violation asymmetries in $B^0\toη'K^0_S$ decays using Belle II data. We consider $η'\toη(\toγγ)π^+π^-$ and $η'\toρ(\toπ^+π^-)γ$ decays. The data were collected at the SuperKEKB asymmetric-energy $e^+e^-$ collider between the years 2019 and 2022, and contain $(387\pm 6) \times 10^6$ bottom-antibottom meson pairs. We reconstruct $829\pm35$ signal dec…
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We describe a measurement of charge-parity ($CP$) violation asymmetries in $B^0\toη'K^0_S$ decays using Belle II data. We consider $η'\toη(\toγγ)π^+π^-$ and $η'\toρ(\toπ^+π^-)γ$ decays. The data were collected at the SuperKEKB asymmetric-energy $e^+e^-$ collider between the years 2019 and 2022, and contain $(387\pm 6) \times 10^6$ bottom-antibottom meson pairs. We reconstruct $829\pm35$ signal decays and extract the $CP$ violating parameters from a fit to the distribution of the proper-decay-time difference between the two $B$ mesons. The measured direct and mixing-induced $CP$ asymmetries are $\text{C}_{η'K^0_S} = -0.19 \pm 0.08 \pm 0.03 $ and $\text{S}_{η'K^0_S} = +0.67 \pm 0.10 \pm 0.04 $, respectively, where the first uncertainties are statistical and the second are systematic. These results are in agreement with current world averages and standard model predictions.
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Submitted 6 February, 2024;
originally announced February 2024.
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Search for a heavy neutral lepton that mixes predominantly with the tau neutrino
Authors:
Belle Collaboration,
M. Nayak,
S. Dey,
A. Soffer,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
R. Ayad,
V. Babu,
Sw. Banerjee,
M. Bauer,
P. Behera,
K. Belous,
M. Bessner,
V. Bhardwaj,
B. Bhuyan,
T. Bilka,
D. Biswas,
A. Bobrov,
D. Bodrov,
M. Bračko,
P. Branchini,
T. E. Browder
, et al. (143 additional authors not shown)
Abstract:
We report a search for a heavy neutral lepton (HNL) that mixes predominantly with $ν_τ$. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. The data sample was collected at and just below the center-of-mass energies of the $Υ(4S)$ and $Υ(5S)$ resonances and has an integrated luminosity of $915~\textrm{fb}^{-1}$, corresponding to…
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We report a search for a heavy neutral lepton (HNL) that mixes predominantly with $ν_τ$. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. The data sample was collected at and just below the center-of-mass energies of the $Υ(4S)$ and $Υ(5S)$ resonances and has an integrated luminosity of $915~\textrm{fb}^{-1}$, corresponding to $(836\pm 12)\times 10^6$ $e^+e^\toτ^+τ^-$ events. We search for production of the HNL (denoted $N$) in the decay $τ^-\to π^- N$ followed by its decay via $N \to μ^+μ^- ν_τ$. The search focuses on the parameter-space region in which the HNL is long lived, so that the $μ^+μ^-$ originate from a common vertex that is significantly displaced from the collision point of the KEKB beams. Consistent with the expected background yield, one event is observed in the data sample after application of all the event-selection criteria. We report limits on the mixing parameter of the HNL with the $τ$ neutrino as a function of the HNL mass.
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Submitted 4 February, 2024;
originally announced February 2024.
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Study of $Υ(10753)$ decays to $π^{+}π^{-}Υ(nS)$ final states at Belle II
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
A. Baur,
A. Beaubien,
F. Becherer,
J. Becker
, et al. (371 additional authors not shown)
Abstract:
We present an analysis of the process $e^{+}e^{-}\toπ^{+}π^{-}Υ(nS)$ (where $n$ = 1, 2, or 3) reconstructed in $19.6\rm$ $\rm fb^{-1}$ of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the $Υ(10753)$ resonance. By analyzing the mass distribution of the $π^+π^-Υ(nS)$ system and the Born cross sections of the $e^{+}e^{-}\toπ^{+}π^{-}Υ(nS)$ process…
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We present an analysis of the process $e^{+}e^{-}\toπ^{+}π^{-}Υ(nS)$ (where $n$ = 1, 2, or 3) reconstructed in $19.6\rm$ $\rm fb^{-1}$ of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the $Υ(10753)$ resonance. By analyzing the mass distribution of the $π^+π^-Υ(nS)$ system and the Born cross sections of the $e^{+}e^{-}\toπ^{+}π^{-}Υ(nS)$ process, we report the first observation of $Υ(10753)$ decays to the $π^{+}π^{-}Υ(1S)$ and $π^{+}π^{-}Υ(2S)$ final states, and find no evidence for decays to $π^{+}π^{-}Υ(3S)$. Possible intermediate states in the $π^+π^-Υ(1S,2S)$ transitions are also investigated, and no evidence for decays proceeding via the $π^\mp Z_b^\pm$ or $f_0(980)Υ(nS)$ intermediate states is found. We measure Born cross sections for the $e^{+}e^{-}\toπ^{+}π^{-}Υ(nS)$ process that, combined with results from Belle, improve the precision of measurements of the $Υ(10753)$ mass and width by nearly a factor of two to $(10756.3\pm2.7\pm0.6)$ MeV/$c^2$ and $(29.7\pm8.5\pm1.1)$ MeV, respectively. The relative ratios of the Born cross sections at the $Υ(10753)$ resonance peak are also reported for the first time.
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Submitted 22 January, 2024;
originally announced January 2024.
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Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ Final State
Authors:
Belle Collaboration,
T. Gu,
V. Savinov,
I. Adachi,
H. Aihara,
D. M. Asner,
H. Atmacan,
T. Aushev,
R. Ayad,
Sw. Banerjee,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
B. Bhuyan,
D. Biswas,
A. Bobrov,
D. Bodrov,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini,
T. E. Browder,
A. Budano,
M. Campajola
, et al. (139 additional authors not shown)
Abstract:
We report the results of the first search for $B^-$ decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ final state using 711~${\rm fb^{-1}}$ of data collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The results are interpreted in terms of both direct baryon-number-violating $B^-$ decay and $Ξ_{c}^{0}-\barΞ_{c}^{0}$ oscillations which follow the S…
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We report the results of the first search for $B^-$ decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ final state using 711~${\rm fb^{-1}}$ of data collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The results are interpreted in terms of both direct baryon-number-violating $B^-$ decay and $Ξ_{c}^{0}-\barΞ_{c}^{0}$ oscillations which follow the Standard Model decay $B^- \to Ξ_{c}^{0} \barΛ_{c}^{-}$. We observe no evidence for baryon number violation and set the 95\% confidence-level upper limits on the ratio of baryon-number-violating and Standard Model branching fractions ${\mathcal{B}(B^- \rightarrow \barΞ_{c}^{0} \barΛ_{c}^{-})}/{\mathcal{B}(B^- \rightarrow Ξ_{c}^{0} \barΛ_{c}^{-})}$ to be $< 2.7\%$ and on the $Ξ_{c}^{0} - \barΞ_{c}^{0}$ oscillation angular frequency $ω$ to be $< 0.76\ \mathrm{ps}^{-1}$ (equivalent to $τ_{\rm mix} > 1.3$~ps).
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Submitted 11 January, 2024; v1 submitted 9 January, 2024;
originally announced January 2024.
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Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow ωω$
Authors:
Belle Collaboration,
Y. Guan,
A. J. Schwartz,
K. Kinoshita,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
R. Ayad,
S. Bahinipati,
Sw. Banerjee,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
B. Bhuyan,
D. Biswas,
A. Bobrov,
D. Bodrov,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini,
A. Budano
, et al. (145 additional authors not shown)
Abstract:
We present a measurement of $B^{0} \rightarrow ωω$, a charmless decay into two vector mesons, using 772 $\times 10^6$ $B\overline{B}$ pairs collected with the Belle detector at the KEKB $e^+e^-$ collider. The decay is observed with a significance of 7.9 standard deviations. We measure a branching fraction $\mathcal{B} = (1.53 \pm 0.29 \pm 0.17) \times 10^{-6}$, a fraction of longitudinal polarizat…
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We present a measurement of $B^{0} \rightarrow ωω$, a charmless decay into two vector mesons, using 772 $\times 10^6$ $B\overline{B}$ pairs collected with the Belle detector at the KEKB $e^+e^-$ collider. The decay is observed with a significance of 7.9 standard deviations. We measure a branching fraction $\mathcal{B} = (1.53 \pm 0.29 \pm 0.17) \times 10^{-6}$, a fraction of longitudinal polarization $f_L = 0.87 \pm 0.13 \pm 0.13$, and a time-integrated $CP$ asymmetry $A_{CP}$ = $-0.44 \pm 0.43 \pm 0.11$, where the first uncertainties listed are statistical and the second are systematic. This is the first observation of $B^{0} \rightarrow ωω$, and the first measurements of $f_L$ and $A_{CP}$ for this decay.
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Submitted 9 January, 2024;
originally announced January 2024.
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A test of lepton flavor universality with a measurement of $R(D^{*})$ using hadronic $B$ tagging at the Belle II experiment
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
R. Ayad,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur
, et al. (412 additional authors not shown)
Abstract:
The ratio of branching fractions $R(D^{*}) = \mathcal{B}(\overline{B} \rightarrow D^{*} τ^{-} \overlineν_τ)$/$\mathcal{B} (\overline{B} \rightarrow D^{*} \ell^{-} \overlineν_{\ell})$, where $\ell$ is an electron or muon, is measured using a Belle~II data sample with an integrated luminosity of $189~\mathrm{fb}^{-1}$ at the SuperKEKB asymmetric-energy $e^{+} e^{-}$ collider. Data is collected at th…
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The ratio of branching fractions $R(D^{*}) = \mathcal{B}(\overline{B} \rightarrow D^{*} τ^{-} \overlineν_τ)$/$\mathcal{B} (\overline{B} \rightarrow D^{*} \ell^{-} \overlineν_{\ell})$, where $\ell$ is an electron or muon, is measured using a Belle~II data sample with an integrated luminosity of $189~\mathrm{fb}^{-1}$ at the SuperKEKB asymmetric-energy $e^{+} e^{-}$ collider. Data is collected at the $Υ(\mathrm{4S})$ resonance, and one $B$ meson in the $Υ(\mathrm{4S})\rightarrow B\overline{B}$ decay is fully reconstructed in hadronic decay modes. The accompanying signal $B$ meson is reconstructed as $\overline{B}\rightarrow D^{*} τ^{-}\overlineν_τ$ using leptonic $τ$ decays. The normalization decay, $\overline{B}\rightarrow D^{*} \ell^{-} \overlineν_{\ell}$, where $\ell$ is an electron or muon, produces the same observable final state particles. The ratio of branching fractions is extracted in a simultaneous fit to two signal-discriminating variables in both channels and yields $R(D^{*}) = 0.262~_{-0.039}^{+0.041}(\mathrm{stat})~_{-0.032}^{+0.035}(\mathrm{syst})$. This result is consistent with the current world average and with standard model predictions.
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Submitted 5 January, 2024;
originally announced January 2024.
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Search for the $e^+e^-\toη_{b}(1S)ω$ and $e^+e^-\toχ_{b0}(1P)ω$ processes at $\sqrt{s}=10.745\,\mathrm{GeV}$
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
F. Becherer,
J. Becker
, et al. (397 additional authors not shown)
Abstract:
We search for the $e^+e^-\toη_b(1S)ω$ and $e^+e^-\toχ_{b0}(1P)ω$ processes at a center-of-mass energy of 10.745 GeV, which is close to the peak of the $Υ(10753)$ state. We use data collected by the Belle II experiment during a special run, corresponding to an integrated luminosity of $9.8\,\mathrm{fb}^{-1}$. We reconstruct $ω\toπ^+π^-π^0$ decays and use the $ω$ meson's recoil mass to search for th…
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We search for the $e^+e^-\toη_b(1S)ω$ and $e^+e^-\toχ_{b0}(1P)ω$ processes at a center-of-mass energy of 10.745 GeV, which is close to the peak of the $Υ(10753)$ state. We use data collected by the Belle II experiment during a special run, corresponding to an integrated luminosity of $9.8\,\mathrm{fb}^{-1}$. We reconstruct $ω\toπ^+π^-π^0$ decays and use the $ω$ meson's recoil mass to search for the signals. We do not find evidence for either process, and set upper limits on the corresponding Born-level cross sections of 2.5 pb and 7.8 pb, respectively, at the 90% confidence level. The $χ_{b0}(1P)ω$ limit is the result of a combination of this analysis and a previous search using full reconstruction.
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Submitted 20 December, 2023;
originally announced December 2023.
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Search for the semileptonic decays $Ξ_c^0 \to Ξ^0\ell^+\ell^-$ at Belle
Authors:
Belle Collaboration,
J. X. Cui,
Y. B. Li,
C. P. Shen,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
T. Aushev,
R. Ayad,
V. Babu,
S. Bahinipati,
Sw. Banerjee,
M. Bauer,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
B. Bhuyan,
T. Bilka,
D. Biswas,
A. Bobrov,
D. Bodrov,
J. Borah,
M. Bračko
, et al. (141 additional authors not shown)
Abstract:
Using the full data sample of 980 $\mathrm{fb}^{-1}$ collected with the Belle detector at the KEKB asymmetric energy electron-positron collider, we report the results of the first search for the rare semileptonic decays $Ξ_c^0 \to Ξ^0\ell^+\ell^-$ ($\ell=e$ or $μ)$. No significant signals are observed in the $Ξ^0\ell^+\ell^-$ invariant-mass distributions. Taking the decay $Ξ_c^0 \to Ξ^- π^+$ as th…
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Using the full data sample of 980 $\mathrm{fb}^{-1}$ collected with the Belle detector at the KEKB asymmetric energy electron-positron collider, we report the results of the first search for the rare semileptonic decays $Ξ_c^0 \to Ξ^0\ell^+\ell^-$ ($\ell=e$ or $μ)$. No significant signals are observed in the $Ξ^0\ell^+\ell^-$ invariant-mass distributions. Taking the decay $Ξ_c^0 \to Ξ^- π^+$ as the normalization mode, we report 90\% credibility upper limits on the branching fraction ratios ${\cal{B}} (Ξ_c^0 \to Ξ^0 e^+ e^-) / {\cal{B}}(Ξ_c^0\to Ξ^-π^+) < 6.7 \times 10^{-3}$ and ${\cal{B}} (Ξ_c^0 \to Ξ^0 μ^+ μ^-) / {\cal{B}}(Ξ_c^0\to Ξ^-π^+) < 4.3 \times 10^{-3}$ based on the phase-space assumption for signal decays. The 90\% credibility upper limits on the absolute branching fractions of ${\cal{B}} (Ξ_c^0 \to Ξ^0 e^+ e^-)$ and ${\cal{B}} (Ξ_c^0 \to Ξ^0 μ^+ μ^-)$ are found to be $9.9 \times 10^{-5}$ and $6.5 \times 10^{-5}$, respectively.
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Submitted 5 December, 2023; v1 submitted 5 December, 2023;
originally announced December 2023.
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Evidence for $B^{+}\to K^{+}ν\barν$ Decays
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien
, et al. (430 additional authors not shown)
Abstract:
We search for the rare decay $B^{+}\rightarrow K^{+}ν\barν$ in a $362\ \rm{fb}^{-1}$ sample of electron-positron collisions at the $Υ(4S)$ resonance collected with the Belle II detector at the SuperKEKB collider. We use the inclusive properties of the accompanying $B$ meson in $Υ(4S) \to B\kern 0.18em\overline{\kern -0.18em B}{}$ events to suppress background from other decays of the signal $B$ ca…
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We search for the rare decay $B^{+}\rightarrow K^{+}ν\barν$ in a $362\ \rm{fb}^{-1}$ sample of electron-positron collisions at the $Υ(4S)$ resonance collected with the Belle II detector at the SuperKEKB collider. We use the inclusive properties of the accompanying $B$ meson in $Υ(4S) \to B\kern 0.18em\overline{\kern -0.18em B}{}$ events to suppress background from other decays of the signal $B$ candidate and light-quark pair production. We validate the measurement with an auxiliary analysis based on a conventional hadronic reconstruction of the accompanying $B$ meson. For background suppression, we exploit distinct signal features using machine learning methods tuned with simulated data. The signal-reconstruction efficiency and background suppression are validated through various control channels. The branching fraction is extracted in a maximum likelihood fit. Our inclusive and hadronic analyses yield consistent results for the $B^{+}\rightarrow K^{+}ν\barν$ branching fraction of $\left[2.7\pm 0.5(\mathrm{stat})\pm 0.5(\mathrm{syst})\right] \times 10^{-5}$ and $\left[1.1^{+0.9}_{-0.8}(\mathrm{stat}){}^{+0.8}_{-0.5}(\mathrm{syst})\right] \times 10^{-5}$, respectively. Combining the results, we determine the branching fraction of the decay $B^{+}\rightarrow K^{+}ν\barν$ to be $\left[2.3 \pm 0.5(\mathrm{stat})^{+0.5}_{-0.4}(\mathrm{syst})\right]\times 10^{-5}$, providing the first evidence for this decay at $3.5$ standard deviations. The combined result is $2.7$ standard deviations above the standard model expectation.
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Submitted 1 March, 2024; v1 submitted 24 November, 2023;
originally announced November 2023.
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First measurement of $R(X_{τ/\ell})$ as an inclusive test of the $b \to c τν$ anomaly
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
A. Baur,
A. Beaubien,
F. Becherer,
J. Becker,
J. V. Bennett
, et al. (368 additional authors not shown)
Abstract:
We measure the tau-to-light-lepton ratio of inclusive $B$-meson branching fractions $R(X_{τ/\ell}) \equiv \mathcal{B}(B\to X τν)/\mathcal{B}(B \to X \ell ν)$, where $\ell$ indicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructed $B$ meson and a charged lepton candidate from $189~\mathrm{fb}^{-1}$ of el…
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We measure the tau-to-light-lepton ratio of inclusive $B$-meson branching fractions $R(X_{τ/\ell}) \equiv \mathcal{B}(B\to X τν)/\mathcal{B}(B \to X \ell ν)$, where $\ell$ indicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructed $B$ meson and a charged lepton candidate from $189~\mathrm{fb}^{-1}$ of electron-positron collision data collected with the Belle II detector. We find $R(X_{τ/\ell}) = 0.228 \pm 0.016~(\mathrm{stat}) \pm 0.036~(\mathrm{syst})$, in agreement with standard-model expectations. This is the first direct measurement of $R(X_{τ/\ell})$.
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Submitted 13 November, 2023;
originally announced November 2023.
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Measurement of the Ratio of Partial Branching Fractions of Inclusive $\overline{B} \to X_u \ell \overlineν$ to $\overline{B} \to X_{c} \ell \overlineν$ and the Ratio of their Spectra with Hadronic Tagging
Authors:
Belle Collaboration,
M. Hohmann,
P. Urquijo,
I. Adachi,
H. Aihara,
D. M. Asner,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
M. Bauer,
J. Bennett,
F. Bernlochner,
M. Bessner,
B. Bhuyan,
T. Bilka,
D. Biswas,
A. Bobrov,
D. Bodrov,
G. Bonvicini,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini,
T. E. Browder
, et al. (135 additional authors not shown)
Abstract:
We present a measurement of the ratio of partial branching fractions of the semi-leptonic inclusive decays, $\overline{B} \to X_{u} \ell \overlineν$ to $\overline{B} \to X_{c} \ell \overlineν$, where $\ell = (e, μ)$, using the full Belle sample of $772 \times 10^{6}$ $B \kern 0.18em\overline{\kern -0.18em B}$ pairs collected at the $Υ(4S)$ resonance. The ratio is measured via a two-dimensional fit…
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We present a measurement of the ratio of partial branching fractions of the semi-leptonic inclusive decays, $\overline{B} \to X_{u} \ell \overlineν$ to $\overline{B} \to X_{c} \ell \overlineν$, where $\ell = (e, μ)$, using the full Belle sample of $772 \times 10^{6}$ $B \kern 0.18em\overline{\kern -0.18em B}$ pairs collected at the $Υ(4S)$ resonance. The ratio is measured via a two-dimensional fit to the squared four-momentum transfer to the lepton pair, and the charged lepton energy in the $B$ meson rest frame, where the latter must be larger than $1$ Ge\kern -0.1em V, covering approximately $86\%$ and $78\%$ of the $\overline{B} \to X_{u} \ell \overlineν$ and $\overline{B} \to X_{c} \ell \overlineν$ phase space, respectively. We find $Δ\mathcal{B}(\overline{B} \to X_{u} \ell \overlineν)/ Δ\mathcal{B}(\overline{B} \to X_{c} \ell \overlineν) = 0.0196(1 \pm 8.4\%_{\rm stat} \pm 7.9\%_{\rm syst})$ where the uncertainties are statistical and systematic, respectively. In addition, we report the partial branching fractions separately for charged and neutral $B$ meson decays, and for electron and muon decay channels. We place a limit on isospin breaking in $\overline{B} \to X_{u} \ell \overlineν$ decays, and find no indication of lepton flavor universality violation in either the charmed or charmless mode. Furthermore, we unfold the $\overline{B} \to X_{u} \ell \overlineν$ and $\overline{B} \to X_{c} \ell \overlineν$ yields and report the differential ratio in lepton energy and four-momentum transfer squared.
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Submitted 1 November, 2023;
originally announced November 2023.
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Breakdown Performance of Guard Ring Designs for Pixel Detectors in $150~\mathrm{nm}$ CMOS Technology
Authors:
Sinuo Zhang,
Ivan Caicedo,
Tomasz Hemperek,
Toko Hirono,
Jochen Dingfelder
Abstract:
Silicon pixel sensors manufactured using commercial CMOS processes are promising instruments for high-energy particle physics experiments due to their high yield and proven radiation hardness. As one of the essential factors for the operation of detectors, the breakdown performance of pixel sensors constitutes the upper limit of the operating voltage. Six types of passive CMOS test structures were…
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Silicon pixel sensors manufactured using commercial CMOS processes are promising instruments for high-energy particle physics experiments due to their high yield and proven radiation hardness. As one of the essential factors for the operation of detectors, the breakdown performance of pixel sensors constitutes the upper limit of the operating voltage. Six types of passive CMOS test structures were fabricated on high-resistivity wafers. Each of them features a combination of different inter-pixel designs and sets of floating guard rings, which differ from each other in the geometrical layout, implantation type, and overhang structure. A comparative study based on leakage current measurements in the sensor substrate of unirradiated samples was carried out to identify correlations between guard ring designs and breakdown voltages. TCAD simulations using the design parameters of the test structures were performed to discuss the observations and, together with the measurements, ultimately provide design features targeting higher breakdown voltages.
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Submitted 24 October, 2023;
originally announced October 2023.
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Search for baryon and lepton number violating decays $\boldsymbol{D \rightarrow p\ell}$
Authors:
Belle Collaboration,
S. Maity,
R. Garg,
S. Bahinipati,
V. Bhardwaj,
H. Aihara,
S. Al Said,
DM Asner,
H. Atmacan,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
M. Bauer,
J. Bennett,
M. Bessner,
D. Biswas,
A. Bobrov,
D. Bodrov,
G. Bonvicini,
J. Borah,
M. Bračko,
P. Branchini,
A. Budano,
M. Campajola
, et al. (137 additional authors not shown)
Abstract:
We search for the baryon and lepton number violating charm decays, $D \rightarrow p\ell$, where $D$ is either a $D^0$ or a $\overline{D}^0$ and $\ell$ is a muon or an electron, using a data sample of $921\,\mathrm{fb}^{-1}$ collected by the Belle detector at the KEKB asymmetric energy $e^{+}e^{-}$ collider. In the absence of significant signals, we set upper limits on the branching fractions in th…
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We search for the baryon and lepton number violating charm decays, $D \rightarrow p\ell$, where $D$ is either a $D^0$ or a $\overline{D}^0$ and $\ell$ is a muon or an electron, using a data sample of $921\,\mathrm{fb}^{-1}$ collected by the Belle detector at the KEKB asymmetric energy $e^{+}e^{-}$ collider. In the absence of significant signals, we set upper limits on the branching fractions in the range $(5 - 8) \times 10^{-7}$ at a 90\% confidence level, depending on the decay mode.
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Submitted 18 March, 2024; v1 submitted 11 October, 2023;
originally announced October 2023.
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Measurement of branching fractions and direct $CP$ asymmetries for $B \to Kπ$ and $B\toππ$ decays at Belle II
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
F. Becherer
, et al. (413 additional authors not shown)
Abstract:
We report measurements of the branching fractions and direct $\it{CP}$ asymmetries of the decays $B^0 \to K^+ π^-$, $B^+ \to K^+ π^0$, $B^+ \to K^0 π^+$, and $B^0 \to K^0 π^0$, and use these for testing the standard model through an isospin-based sum rule. In addition, we measure the branching fraction and direct $\it{CP}$ asymmetry of the decay $B^+ \to π^+π^0$ and the branching fraction of the d…
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We report measurements of the branching fractions and direct $\it{CP}$ asymmetries of the decays $B^0 \to K^+ π^-$, $B^+ \to K^+ π^0$, $B^+ \to K^0 π^+$, and $B^0 \to K^0 π^0$, and use these for testing the standard model through an isospin-based sum rule. In addition, we measure the branching fraction and direct $\it{CP}$ asymmetry of the decay $B^+ \to π^+π^0$ and the branching fraction of the decay $B^0 \to π^+π^-$. The data are collected with the Belle II detector from $e^+e^-$ collisions at the $Υ(4S)$ resonance produced by the SuperKEKB asymmetric-energy collider and contain $387\times 10^6$ bottom-antibottom meson pairs. Signal yields are determined in two-dimensional fits to background-discriminating variables, and range from 500 to 3900 decays, depending on the channel. We obtain $-0.03 \pm 0.13 \pm 0.04$ for the sum rule, in agreement with the standard model expectation of zero and with a precision comparable to the best existing determinations.
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Submitted 5 January, 2024; v1 submitted 10 October, 2023;
originally announced October 2023.
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Determination of $|V_{cb}|$ using $\overline{B}^0\to D^{*+}\ell^-\barν_\ell$ decays with Belle II
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
F. Becherer,
J. Becker
, et al. (394 additional authors not shown)
Abstract:
We determine the CKM matrix-element magnitude $|V_{cb}|$ using $\overline{B}^0\to D^{*+}\ell^-\barν_\ell$ decays reconstructed in $189 \, \mathrm{fb}^{-1}$ of collision data collected by the Belle II experiment, located at the SuperKEKB $e^+e^-$ collider. Partial decay rates are reported as functions of the recoil parameter $w$ and three decay angles separately for electron and muon final states.…
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We determine the CKM matrix-element magnitude $|V_{cb}|$ using $\overline{B}^0\to D^{*+}\ell^-\barν_\ell$ decays reconstructed in $189 \, \mathrm{fb}^{-1}$ of collision data collected by the Belle II experiment, located at the SuperKEKB $e^+e^-$ collider. Partial decay rates are reported as functions of the recoil parameter $w$ and three decay angles separately for electron and muon final states. We obtain $|V_{cb}|$ using the Boyd-Grinstein-Lebed and Caprini-Lellouch-Neubert parametrizations, and find $|V_{cb}|_\mathrm{BGL}=(40.57\pm 0.31 \pm 0.95\pm 0.58)\times 10^{-3}$ and $|V_{cb}|_\mathrm{CLN}=(40.13 \pm 0.27 \pm 0.93\pm 0.58 )\times 10^{-3}$ with the uncertainties denoting statistical components, systematic components, and components from the lattice QCD input, respectively. The branching fraction is measured to be ${\cal B}(\overline{B}^0\to D^{*+}\ell^-\barν_\ell)=(4.922 \pm 0.023 \pm 0.220)\%$. The ratio of branching fractions for electron and muon final states is found to be $0.998 \pm 0.009 \pm 0.020$. In addition, we determine the forward-backward angular asymmetry and the $D^{*+}$ longitudinal polarization fractions. All results are compatible with lepton-flavor universality in the Standard Model.
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Submitted 4 December, 2023; v1 submitted 2 October, 2023;
originally announced October 2023.
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Characterization, Simulation and Test Beam Data Analysis of Stitched Passive CMOS Strip Sensors
Authors:
I. Zatocilova,
J. -H. Arling,
M. Baselga,
N. Davis,
L. Diehl,
J. Dingfelder,
I. -M. Gregor,
M. Hauser,
T. Hemperek,
F. Hügging,
K. Jakobs,
M. Karagounis,
K. Kröninger,
F. Lex,
U. Parzefall,
A. Rodriguez,
B. Sari,
N. Sorgenfrei,
S. Spannagel,
D. Sperlich,
T. Wang,
J. Weingarten
Abstract:
In the passive CMOS Strips Project, strip sensors were designed at the University of Bonn and produced by LFoundry in 150 nm technology, with an additional backside processing from IZM Berlin. Up to five individual reticules were connected by stitching at the foundry in order to obtain the typical strip lengths required for the LHC Phase-II upgrade of ATLAS or CMS trackers. After dicing, sensors w…
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In the passive CMOS Strips Project, strip sensors were designed at the University of Bonn and produced by LFoundry in 150 nm technology, with an additional backside processing from IZM Berlin. Up to five individual reticules were connected by stitching at the foundry in order to obtain the typical strip lengths required for the LHC Phase-II upgrade of ATLAS or CMS trackers. After dicing, sensors were tested in a probe station and characterised with a Sr90-source as well as laser-based edge- and top-TCT systems. Sensors were also simulated using Sentaurus TCAD. At last, detector modules were constructed from several sensors and thoroughly studied in two beam campaigns at DESY. All of these measurements were performed before and after irradiation. This contribution provides an overview of simulation results, summarises the laboratory measurements and in particular presents first test beam results for irradiated and unirradiated passive CMOS strip sensors. We are demonstrating that large area sensors with sufficient radiation hardness can be obtained by stitching during the CMOS process, and presenting our plans for the next submission in the framework of this project.
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Submitted 15 November, 2023; v1 submitted 28 September, 2023;
originally announced September 2023.
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Search for charged-lepton flavor violation in $Υ(2S) \to \ell^\mpτ^\pm$ ($\ell=e,μ$) decays at Belle
Authors:
R. Dhamija,
S. Nishida,
A. Giri,
I. Adachi,
H. Aihara,
D. M. Asner,
T. Aushev,
R. Ayad,
V. Babu,
S. Bahinipati,
Sw. Banerjee,
M. Bauer,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
D. Biswas,
D. Bodrov,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini,
T. E. Browder,
A. Budano
, et al. (156 additional authors not shown)
Abstract:
We report a search for the charged-lepton flavor violation in $Υ(2S) \to \ell^\mpτ^\pm$ ($\ell=e,μ$) decays using a $25~\fbi$ $Υ(2S)$ sample collected by the Belle detector at the KEKB $e^{+}$$e^-$ asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ($\mathcal{B}$) at 90\% confidence level. We obtain the most stringent upper limits:…
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We report a search for the charged-lepton flavor violation in $Υ(2S) \to \ell^\mpτ^\pm$ ($\ell=e,μ$) decays using a $25~\fbi$ $Υ(2S)$ sample collected by the Belle detector at the KEKB $e^{+}$$e^-$ asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ($\mathcal{B}$) at 90\% confidence level. We obtain the most stringent upper limits: $\mathcal{B}(\Ytomutau) < 0.23 \times 10^{-6}$ and $\mathcal{B}(\Ytoetau) < 1.12 \times 10^{-6}$.
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Submitted 26 February, 2024; v1 submitted 6 September, 2023;
originally announced September 2023.
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Observation of charmed strange meson pair production in $Υ(2S)$ decays and in $e^{+}e^{-}$ annihilation at $\sqrt{s} = 10.52~ \rm{GeV}$
Authors:
Belle Collaboration,
B. S. Gao,
W. J. Zhu,
X. L. Wang,
I. Adachi,
H. Aihara,
D. M. Asner,
V. Aulchenko,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
M. Bauer,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
T. Bilka,
D. Biswas,
A. Bobrov,
D. Bodrov,
A. Bondar,
A. Bozek,
M. Bračko
, et al. (143 additional authors not shown)
Abstract:
We observe the process $Υ(2S)\to D_s^{(*)+} D_{sJ}^{-}$ and continuum production $e^+e^- \to D_s^{(*)+} D_{sJ}^- $ at $\sqrt{s} = 10.52$ GeV (and their charge conjugates) using the data samples collected by the Belle detector at KEKB, where $D_{sJ}^-$ is $D_{s1}(2536)^-$ or $D^{*}_{s2}(2573)^-$. Both $D_{sJ}^-$ states are identified through their decay into $\bar{K}\bar{D}^{(*)}$. We measure the p…
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We observe the process $Υ(2S)\to D_s^{(*)+} D_{sJ}^{-}$ and continuum production $e^+e^- \to D_s^{(*)+} D_{sJ}^- $ at $\sqrt{s} = 10.52$ GeV (and their charge conjugates) using the data samples collected by the Belle detector at KEKB, where $D_{sJ}^-$ is $D_{s1}(2536)^-$ or $D^{*}_{s2}(2573)^-$. Both $D_{sJ}^-$ states are identified through their decay into $\bar{K}\bar{D}^{(*)}$. We measure the products of branching fractions ${\cal B}(Υ(2S) \to D_{s}^{(*)+} D_{sJ}^-) {\cal B}(D_{sJ}^-\to \bar{K} \bar{D}^{(*)})$ and the Born cross sections $σ^{\rm Born}(e^+e^- \to D_{s}^{(*)+} D_{sJ}^-) {\cal B}(D_{sJ}^-\to \bar{K} \bar{D}^{(*)})$, and then compare the ratios $R_1 \equiv {\cal B}(Υ(2S)\to D_{s}^{(*)+} D_{sJ}^-)/{\cal B}(Υ(2S)\toμ^{+}μ^-)$ for $Υ(2S)$ decays and $R_2 \equiv σ^{\rm Born}(e^+e^-\to D_{s}^{(*)+}D_{sJ}^-)/σ^{\rm Born}(e^+e^-\to μ^{+}μ^-)$ for continuum production. We obtain $R_1/R_2 = 9.7\pm 2.3 \pm 1.1$, $6.8 \pm 2.1 \pm 0.8$, $10.2 \pm 3.3 \pm 2.5$, and $3.4 \pm 2.1 \pm 0.5$ for the $D_s^+ D_{s1}(2536)^-$, $D_s^{*+} D_{s1}(2536)^-$, $D_s^+ D_{s2}^{*}(2573)^{-}$, and $D_s^{*+} D_{s2}^{*}(2573)^{-}$ final states in the $D_{sJ}^-\to K^{-} \bar{D}^{(*)0}$ modes, respectively. Therefore, the strong decay is expected to dominate in the $Υ(2S)\to D_{s}^{(*)+}D_{sJ}^-$ processes. We also measure the ratios of branching fractions ${\cal B}(D_{s1}(2536)^-\to K_S^0 D^{*}(2010)^{-})/{\cal B}(D_{s1}(2536)^-\to K^{-} D^{*}(2007)^0) = 0.48 \pm 0.07 \pm 0.02$ and ${\cal B}(D_{s2}^{*}(2573)^- \to K_S^0 D^-)/{\cal B}(D_{s2}^{*}(2573)^- \to K^{-}D^0) = 0.49 \pm 0.10 \pm 0.02$, which are consistent with isospin symmetry. The second ratio is the first measurement of this quantity. Here, the first uncertainties are statistical and the second are systematic.
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Submitted 21 August, 2023; v1 submitted 17 August, 2023;
originally announced August 2023.
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Measurement of branching-fraction ratios and $CP$ asymmetries in $B^{\pm} \to D_{CP\pm}K^{\pm}$ decays at Belle and Belle II
Authors:
The Belle,
Belle II Collaborations,
:,
I. Adachi,
L. Aggarwal,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
R. Ayad,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien
, et al. (405 additional authors not shown)
Abstract:
We report results from a study of $B^\pm \rightarrow DK^\pm$ decays followed by $D$ decaying to $CP$~eigenstates, where $D$ indicates a $D^0$ or $\bar{D}^{0}$ meson. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle $φ_{3}$. The results are based on a combined analysis of the final data set of $772 \times 10^6~B\bar{B}$ pairs collected by the Belle experiment and…
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We report results from a study of $B^\pm \rightarrow DK^\pm$ decays followed by $D$ decaying to $CP$~eigenstates, where $D$ indicates a $D^0$ or $\bar{D}^{0}$ meson. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle $φ_{3}$. The results are based on a combined analysis of the final data set of $772 \times 10^6~B\bar{B}$ pairs collected by the Belle experiment and a data set of $198 \times 10^6~B\bar{B}$ pairs collected by the Belle~II experiment, both in electron-positron collisions at the $Υ(4S)$ resonance. We measure the $CP$ asymmetries to be $\mathcal{ A}_{CP +} =~(+12.5 \pm 5.8 \pm 1.4)\% $ and $\mathcal{ A}_{CP -} =~(-16.7 \pm 5.7 \pm 0.6)\%$, and the ratios of branching fractions to be $\mathcal{ R}_{CP+}=~1.164 \pm 0.081 \pm 0.036 $ and $\mathcal{ R}_{CP-} =~1.151 \pm 0.074 \pm 0.019$. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries $\mathcal{A}_{CP +}$ and $\mathcal{A}_{CP -}$ have similar magnitudes and opposite signs; their difference corresponds to 3.5~standard deviations. From these values we calculate 68.3\% confidence intervals of ($8.5^{\circ}<φ_{3}<16.5^{\circ}$) or ($84.5^{\circ}<φ_{3}<95.5^{\circ}$) or ($163.3^{\circ}<φ_{3}<171.5^{\circ}$) and $0.321<r_{B}<0.465$.
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Submitted 10 August, 2023; v1 submitted 9 August, 2023;
originally announced August 2023.
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Tests of light-lepton universality in angular asymmetries of $B^0 \to D^{*-} \ell ν$ decays
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
F. Becherer,
J. Becker
, et al. (394 additional authors not shown)
Abstract:
We present the first comprehensive tests of light-lepton universality in the angular distributions of semileptonic $B^0$-meson decays to charged spin-1 charmed mesons. We measure five angular-asymmetry observables as functions of the decay recoil that are sensitive to lepton-universality-violating contributions. We use events where one neutral $B$ is fully reconstructed in…
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We present the first comprehensive tests of light-lepton universality in the angular distributions of semileptonic $B^0$-meson decays to charged spin-1 charmed mesons. We measure five angular-asymmetry observables as functions of the decay recoil that are sensitive to lepton-universality-violating contributions. We use events where one neutral $B$ is fully reconstructed in $Υ\left(4S\right)\to{}B \overline{B}$ decays in data corresponding to $189~\mathrm{fb}^{-1}$ integrated luminosity from electron-positron collisions collected with the Belle II detector. We find no significant deviation from the standard model expectations.
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Submitted 2 November, 2023; v1 submitted 3 August, 2023;
originally announced August 2023.
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Measurement of $CP$ asymmetries in $B^0\to φK^0_S$ decays with Belle II
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
F. Becherer
, et al. (410 additional authors not shown)
Abstract:
We present a measurement of time-dependent rate asymmetries in $B^0\to φK^0_S$ decays to search for non-standard-model physics in $b\to q \overline{q}s$ transitions. The data sample is collected with the Belle II detector at the SuperKEKB asymmetric-energy $e^{+}e^{-}$ collider in 2019-2022 and contains $(387\pm 6)\times 10^6$ bottom-antibottom mesons from $Υ(4S)$ resonance decays. We reconstruct…
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We present a measurement of time-dependent rate asymmetries in $B^0\to φK^0_S$ decays to search for non-standard-model physics in $b\to q \overline{q}s$ transitions. The data sample is collected with the Belle II detector at the SuperKEKB asymmetric-energy $e^{+}e^{-}$ collider in 2019-2022 and contains $(387\pm 6)\times 10^6$ bottom-antibottom mesons from $Υ(4S)$ resonance decays. We reconstruct $162\pm17$ signal events and extract the charge-parity ($CP$) violating parameters from a fit to the distribution of the proper-decay-time difference of the two $B$ mesons. The measured direct and mixing-induced $CP$ asymmetries are $A=0.31\pm0.20\pm0.05$ and $S=0.54\pm0.26^{+0.06}_{-0.08}$, respectively, where the first uncertainties are statistical and the second are systematic. The results are compatible with the $CP$ asymmetries observed in $b\to c\overline{c} s$ transitions.
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Submitted 26 October, 2023; v1 submitted 6 July, 2023;
originally announced July 2023.
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Search for a $τ^+τ^-$ resonance in $e^{+}e^{-}\rightarrow μ^{+}μ^{-} τ^+τ^-$ events with the Belle II experiment
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien
, et al. (442 additional authors not shown)
Abstract:
We report the first search for a non-standard-model resonance decaying into $τ$ pairs in $e^{+}e^{-}\rightarrow μ^{+}μ^{-} τ^+τ^-$ events in the 3.6-10 GeV/$c^{2}$ mass range. We use a 62.8 fb$^{-1}$ sample of $e^+e^-$ collisions collected at a center-of-mass energy of 10.58 GeV by the Belle II experiment at the SuperKEKB collider. The analysis probes three different models predicting a spin-1 par…
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We report the first search for a non-standard-model resonance decaying into $τ$ pairs in $e^{+}e^{-}\rightarrow μ^{+}μ^{-} τ^+τ^-$ events in the 3.6-10 GeV/$c^{2}$ mass range. We use a 62.8 fb$^{-1}$ sample of $e^+e^-$ collisions collected at a center-of-mass energy of 10.58 GeV by the Belle II experiment at the SuperKEKB collider. The analysis probes three different models predicting a spin-1 particle coupling only to the heavier lepton families, a Higgs-like spin-0 particle that couples preferentially to charged leptons (leptophilic scalar), and an axion-like particle, respectively. We observe no evidence for a signal and set exclusion limits at 90% confidence level on the product of cross section and branching fraction into $τ$ pairs, ranging from 0.7 fb to 24 fb, and on the couplings of these processes. We obtain world-leading constraints on the couplings for the leptophilic scalar model for masses above 6.5 GeV/$c^2$ and for the axion-like particle model over the entire mass range.
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Submitted 23 September, 2023; v1 submitted 21 June, 2023;
originally announced June 2023.
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Measurement of $C\!P$ asymmetries and branching-fraction ratios for $B^\pm \to DK^\pm$ and $Dπ^\pm$ with $D\to K^0_{\rm S} K^\pmπ^\mp$ using Belle and Belle II data
Authors:
Belle,
Belle II Collaboration,
:,
I. Adachi,
L. Aggarwal,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
T. Aushev,
V. Aushev,
M. Aversano,
R. Ayad,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker
, et al. (386 additional authors not shown)
Abstract:
We measure $C\!P$ asymmetries and branching-fraction ratios for $B^\pm \to DK^\pm$ and $Dπ^\pm$ decays with $D\to K^0_{\rm S} K^\pmπ^\mp$, where $D$ is a superposition of $D^0$ and $\bar{D}^0$. We use the full data set of the Belle experiment, containing $772\times 10^6~B\bar{B}$ pairs, and data from the Belle~II experiment, containing $387\times 10^6~B\bar{B}$ pairs, both collected in electron-po…
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We measure $C\!P$ asymmetries and branching-fraction ratios for $B^\pm \to DK^\pm$ and $Dπ^\pm$ decays with $D\to K^0_{\rm S} K^\pmπ^\mp$, where $D$ is a superposition of $D^0$ and $\bar{D}^0$. We use the full data set of the Belle experiment, containing $772\times 10^6~B\bar{B}$ pairs, and data from the Belle~II experiment, containing $387\times 10^6~B\bar{B}$ pairs, both collected in electron-positron collisions at the $Υ(4S)$ resonance. Our results provide model-independent information on the unitarity triangle angle $φ_3$.
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Submitted 25 September, 2023; v1 submitted 5 June, 2023;
originally announced June 2023.
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Search for a long-lived spin-0 mediator in $b\to s$ transitions at the Belle II experiment
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker,
P. K. Behera
, et al. (389 additional authors not shown)
Abstract:
Additional spin-0 particles appear in many extensions of the standard model. We search for long-lived spin-0 particles $S$ in $B$-meson decays mediated by a $b\to s$ quark transition in $e^+e^-$ collisions at the $Υ(4S)$ resonance at the Belle II experiment. Based on a sample corresponding to an integrated luminosity of $189 \mathrm{\,fb}^{-1}$, we observe no evidence for signal. We set model-inde…
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Additional spin-0 particles appear in many extensions of the standard model. We search for long-lived spin-0 particles $S$ in $B$-meson decays mediated by a $b\to s$ quark transition in $e^+e^-$ collisions at the $Υ(4S)$ resonance at the Belle II experiment. Based on a sample corresponding to an integrated luminosity of $189 \mathrm{\,fb}^{-1}$, we observe no evidence for signal. We set model-independent upper limits on the product of branching fractions $\mathrm{Br}(B^0\to K^*(892)^0(\to K^+π^-)S)\times \mathrm{Br}(S\to x^+x^-)$ and $\mathrm{Br}(B^+\to K^+S)\times \mathrm{Br}(S\to x^+x^-)$, where $x^+x^-$ indicates $e^+e^-, μ^+μ^-, π^+π^-$, or $K^+K^-$, as functions of $S$ mass and lifetime at the level of $10^{-7}$.
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Submitted 5 June, 2023;
originally announced June 2023.
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Precise measurement of the $D^+_s$ lifetime at Belle II
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker,
P. K. Behera,
J. V. Bennett
, et al. (337 additional authors not shown)
Abstract:
We measure the lifetime of the $D_s^+$ meson using a data sample of 207 fb$^{-1}$ collected by the Belle II experiment running at the SuperKEKB asymmetric-energy $e^+ e^-$ collider. The lifetime is determined by fitting the decay-time distribution of a sample of $116\times 10^3$ $D_s^+\rightarrowφπ^+$ decays. Our result is $τ^{}_{D^+_s} = (499.5\pm 1.7\pm 0.9)$ fs, where the first uncertainty is s…
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We measure the lifetime of the $D_s^+$ meson using a data sample of 207 fb$^{-1}$ collected by the Belle II experiment running at the SuperKEKB asymmetric-energy $e^+ e^-$ collider. The lifetime is determined by fitting the decay-time distribution of a sample of $116\times 10^3$ $D_s^+\rightarrowφπ^+$ decays. Our result is $τ^{}_{D^+_s} = (499.5\pm 1.7\pm 0.9)$ fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.
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Submitted 22 December, 2023; v1 submitted 1 June, 2023;
originally announced June 2023.
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Measurement of the $τ$-lepton mass with the Belle~II experiment
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
F. Becherer
, et al. (396 additional authors not shown)
Abstract:
We present a measurement of the $τ$-lepton mass using a sample of about 175 million $e^+e^- \to τ^+τ^-$ events collected with the Belle II detector at the SuperKEKB $e^+e^-$ collider at a center-of-mass energy of $10.579\,\mathrm{Ge\kern -0.1em V}$. This sample corresponds to an integrated luminosity of $190\,\mathrm{fb^{-1}}$. We use the kinematic edge of the $τ$ pseudomass distribution in the de…
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We present a measurement of the $τ$-lepton mass using a sample of about 175 million $e^+e^- \to τ^+τ^-$ events collected with the Belle II detector at the SuperKEKB $e^+e^-$ collider at a center-of-mass energy of $10.579\,\mathrm{Ge\kern -0.1em V}$. This sample corresponds to an integrated luminosity of $190\,\mathrm{fb^{-1}}$. We use the kinematic edge of the $τ$ pseudomass distribution in the decay ${τ^-\toπ^-π^+π^-ν_τ}$ and measure the $τ$ mass to be $1777.09 \pm 0.08 \pm 0.11 \,\mathrm{Me\kern -0.1em V\!/c^2}$, where the first uncertainty is statistical and the second systematic. This result is the most precise to date.
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Submitted 30 May, 2023;
originally announced May 2023.
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Search for the double-charmonium state with $η_c J/ψ$ at Belle
Authors:
Belle Collaboration,
J. H. Yin,
Y. B. Li,
E. Won,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
T. Bilka,
D. Biswas,
D. Bodrov,
G. Bonvicini,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini,
T. E. Browder
, et al. (158 additional authors not shown)
Abstract:
We measure the cross section of $e^+e^-\rightarrowη_c J/ψ$ at the $Υ(nS) (n=1$ -- $5)$ on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of $955~\rm fb^{-1}$. We also search for double charmonium production in $e^+e^-\rightarrowη_c J/ψ$ via initial state radiation near the $η_c J/ψ$ threshold. No evident…
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We measure the cross section of $e^+e^-\rightarrowη_c J/ψ$ at the $Υ(nS) (n=1$ -- $5)$ on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of $955~\rm fb^{-1}$. We also search for double charmonium production in $e^+e^-\rightarrowη_c J/ψ$ via initial state radiation near the $η_c J/ψ$ threshold. No evident signal of the double charmonium state is found, but evidence for the $e^+e^-\rightarrowη_c J/ψ$ process is found with a statistical significance greater than $3.3σ$ near the $η_c J/ψ$ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.
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Submitted 7 August, 2023; v1 submitted 29 May, 2023;
originally announced May 2023.
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Search for $C\!P$ violation using $T$-odd correlations in $D_{(s)}^{+}\to K^{+} K^{-}π^{+}π^{0}$, $D_{(s)}^{+}\to K^{+} π^{-}π^{+}π^{0}$, and $D^{+}\to K^{-}π^{+}π^{+}π^{0}$ decays
Authors:
Belle Collaboration,
L. K. Li,
A. J. Schwartz,
E. Won,
K. Kinoshita,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
V. Aulchenko,
T. Aushev,
V. Babu,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
T. Bilka,
D. Biswas,
A. Bobrov,
D. Bodrov,
G. Bonvicini,
J. Borah,
M. Bračko,
P. Branchini
, et al. (152 additional authors not shown)
Abstract:
We search for $C\!P$ violation using $T$-odd correlations in five $D_{(s)}^{+}$ and $D_{(s)}^{-}$ four-body decays. Our analysis is based on 980 $\rm fb^{-1}$ of data collected by the Belle detector at the KEKB energy-asymmetric $e^+e^-$ collider. Our results for the $T$-odd $C\!P$-violating parameter $a^{T\text{-odd}}_{C\!P}$ are:…
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We search for $C\!P$ violation using $T$-odd correlations in five $D_{(s)}^{+}$ and $D_{(s)}^{-}$ four-body decays. Our analysis is based on 980 $\rm fb^{-1}$ of data collected by the Belle detector at the KEKB energy-asymmetric $e^+e^-$ collider. Our results for the $T$-odd $C\!P$-violating parameter $a^{T\text{-odd}}_{C\!P}$ are: $a^{T\text{-odd}}_{C\!P}({D^{+}\to K^{-}K^{+}π^{+}π^{0}}) = (+2.6\pm 6.6\pm 1.3 )\times10^{-3}$, $a^{T\text{-odd}}_{C\!P}({D^{+}\to K^{+}π^{-}π^{+}π^{0}}) = (-1.3\pm 4.2\pm 0.1 )\times10^{-2}$, $a^{T\text{-odd}}_{C\!P}({D^{+}\to K^{-}π^{+}π^{+}π^{0}}) = (+0.2\pm 1.5\pm 0.8 )\times10^{-3}$, $a^{T\text{-odd}}_{C\!P}({D_s^{+}\to K^{+}π^{-}π^{+}π^{0}}) = (-1.1\pm 2.2\pm 0.1 )\times10^{-2}$, and $a^{T\text{-odd}}_{C\!P}({D_s^{+}\to K^{-}K^{+}π^{+}π^{0}}) = (+2.2\pm 3.3\pm 4.3 )\times10^{-3}$, where the uncertainties are statistical and systematic, respectively. These results are the first such measurements and are all consistent with zero. They include the first measurement for a $D^+_s$ singly Cabibbo-suppressed decay, and the first measurement for a $D$ meson doubly Cabibbo-suppressed decay. We also measure $a^{T\text{-odd}}_{C\!P}$ in different subregions of phase space, where the decays are dominated by different intermediate resonance states such as $D^+\toφρ^+$, $\bar{K}^{*0}K^{*+}$, and $\bar{K}^{*0}ρ^+$; and $D_s^+\to K^{*+}ρ^{0}$, $K^{*0}ρ^{+}$, $φρ^+$, and $\bar{K}^{*0}K^{*+}$. No evidence for $C\!P$ violation is found.
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Submitted 22 May, 2023;
originally announced May 2023.
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Search for $CP$ violation in $D^{+}_{(s)}\rightarrow K^{+}K^{0}_{S}h^{+}h^{-}$ $(h=K,π)$ decays and observation of the Cabibbo-suppressed decay $D^{+}_{s}\rightarrow K^{+}K^{-}K^{0}_{S}π^{+}$
Authors:
Belle Collaboration,
H. K. Moon,
E. Won,
I. Adachi,
H. Aihara,
D. M. Asner,
H. Atmacan,
V. Aulchenko,
T. Aushev,
R. Ayad,
V. Babu,
S. Bahinipati,
Sw. Banerjee,
M. Bauer,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
B. Bhuyan,
D. Biswas,
D. Bodrov,
J. Borah,
A. Bozek,
M. Bračko
, et al. (183 additional authors not shown)
Abstract:
We search for $CP$ violation by measuring a $T$-odd asymmetry in the Cabibbo-suppressed $D^{+}\rightarrow K^{+}K^{0}_{S}π^{+}π^{-} $ decay, and in the Cabibbo-favored $D^{+}_{s}\rightarrow K^{+}K^{0}_{S}π^{+}π^{-}$ and $D^{+}\rightarrow K^{+}K^{-}K^{0}_{S}π^{+}$ decays. We use 980 ${\rm fb}^{-1}$ of data collected by the Belle detector running at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. T…
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We search for $CP$ violation by measuring a $T$-odd asymmetry in the Cabibbo-suppressed $D^{+}\rightarrow K^{+}K^{0}_{S}π^{+}π^{-} $ decay, and in the Cabibbo-favored $D^{+}_{s}\rightarrow K^{+}K^{0}_{S}π^{+}π^{-}$ and $D^{+}\rightarrow K^{+}K^{-}K^{0}_{S}π^{+}$ decays. We use 980 ${\rm fb}^{-1}$ of data collected by the Belle detector running at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The $C\!P$-violating $T$-odd parameter ${a}^{T\text{-}\rm{odd}}_{CP}$ is measured to be ${a}^{T\text{-}\rm{odd}}_{CP}(D^{+}\rightarrow K^{+}K^{0}_{S}π^{+}π^{-})=(0.34\pm0.87\pm0.32)\%,$ ${a}^{T\text{-}\rm{odd}}_{CP}(D^{+}_{s}\rightarrow K^{+}K^{0}_{S}π^{+}π^{-})=(-0.46\pm0.63\pm0.38)\%,$ and ${a}^{T\text{-}\rm{odd}}_{CP}(D^{+}\rightarrow K^{+}K^{-}K^{0}_{S}π^{+})=(-3.34\pm2.66\pm0.35)\%,$ where the first uncertainty is statistical and the second is systematic. We also report the first observation of the Cabibbo-suppressed decay $D^{+}_{s}\rightarrow K^{+}K^{-}K^{0}_{S}π^{+}$. The branching fraction is measured relative to that of the analogous Cabibbo-favored decay : $B(D^{+}_{s}\rightarrow K^{+}K^{-}K^{0}_{S}π^{+}) / B(D^{+}_{s}\rightarrow K^{+}K^{0}_{S}π^{+}π^{-}) = (1.36\pm 0.15\pm 0.04)\%$.
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Submitted 22 November, 2023; v1 submitted 18 May, 2023;
originally announced May 2023.
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Measurement of $C\!P$ violation in $B^{0}\rightarrow K_{S}^{0}π^{0}$ decays at Belle II
Authors:
Belle II Collaboration,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker
, et al. (377 additional authors not shown)
Abstract:
We report a measurement of the $C\!P$-violating parameters $A$ and $S$ in $B^{0}\to K_{S}^{0} π^{0}$ decays at Belle II using a sample of $387\times 10^{6}$ $B\bar{B}$ events recorded in $e^{+}e^{-}$ collisions at a center-of-mass energy corresponding to the $Υ(4S)$ resonance. These parameters are determined by fitting the proper decay-time distribution of a sample of 415 signal events. We obtain…
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We report a measurement of the $C\!P$-violating parameters $A$ and $S$ in $B^{0}\to K_{S}^{0} π^{0}$ decays at Belle II using a sample of $387\times 10^{6}$ $B\bar{B}$ events recorded in $e^{+}e^{-}$ collisions at a center-of-mass energy corresponding to the $Υ(4S)$ resonance. These parameters are determined by fitting the proper decay-time distribution of a sample of 415 signal events. We obtain $A = 0.04^{+0.15}_{-0.14}\pm 0.05$ and $S = 0.75^{+0.20}_{-0.23}\pm 0.04$, where the first uncertainties are statistical and the second are systematic.
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Submitted 7 October, 2023; v1 submitted 12 May, 2023;
originally announced May 2023.
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Search for lepton-flavor-violating $τ^- \to \ell^-φ$ decays in 2019-2021 Belle II data
Authors:
Belle II Collaboration,
F. Abudinén,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
P. Ahlburg,
H. Ahmed,
J. K. Ahn,
H. Aihara,
N. Akopov,
A. Aloisio,
L. Andricek,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
V. Aulchenko,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
S. Bacher,
H. Bae,
S. Bahinipati,
A. M. Bakich,
P. Bambade
, et al. (555 additional authors not shown)
Abstract:
We report a search for lepton-flavor-violating decays $τ^- \to \ell^- φ$ ($\ell^- =e^-,μ^-$) at the Belle II experiment, using a sample of electron-positron data produced at the SuperKEKB collider in 2019-2021 and corresponding to an integrated luminosity of 190 fb$^{-1}$. We use a new untagged selection for $e^+e^- \to τ^+τ^-$ events, where the signal $τ$ is searched for as a neutrinoless final s…
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We report a search for lepton-flavor-violating decays $τ^- \to \ell^- φ$ ($\ell^- =e^-,μ^-$) at the Belle II experiment, using a sample of electron-positron data produced at the SuperKEKB collider in 2019-2021 and corresponding to an integrated luminosity of 190 fb$^{-1}$. We use a new untagged selection for $e^+e^- \to τ^+τ^-$ events, where the signal $τ$ is searched for as a neutrinoless final state of a single charged lepton and a $φ$ meson and the other $τ$ is not reconstructed in any specific decay mode, in contrast to previous measurements by the BaBar and Belle experiments. We find no evidence for $τ^- \to \ell^- φ$ decays and obtain upper limits on the branching fractions at 90% confidence level of 23 $\times 10^{-8}$ and 9.7$\times 10^{-8}$ for $τ^- \rightarrow e^-φ$ and $τ^- \rightarrow μ^-φ$, respectively
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Submitted 16 May, 2023; v1 submitted 8 May, 2023;
originally announced May 2023.
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Observation of ${B\to D^{(*)} K^- K^{0}_S}$ decays using the 2019-2022 Belle II data sample
Authors:
Belle II Collaboration,
F. Abudinén,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
P. Ahlburg,
H. Ahmed,
J. K. Ahn,
H. Aihara,
N. Akopov,
A. Aloisio,
L. Andricek,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
V. Aulchenko,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
S. Bacher,
H. Bae,
S. Bahinipati,
A. M. Bakich,
P. Bambade
, et al. (555 additional authors not shown)
Abstract:
We present a measurement of the branching fractions of four $B^{0,-}\to D^{(*)+,0} K^- K^{0}_S$ decay modes. The measurement is based on data from SuperKEKB electron-positron collisions at the $Υ(4S)$ resonance collected with the Belle II detector and corresponding to an integrated luminosity of ${362~\text{fb}^{-1}}$. The event yields are extracted from fits to the distributions of the difference…
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We present a measurement of the branching fractions of four $B^{0,-}\to D^{(*)+,0} K^- K^{0}_S$ decay modes. The measurement is based on data from SuperKEKB electron-positron collisions at the $Υ(4S)$ resonance collected with the Belle II detector and corresponding to an integrated luminosity of ${362~\text{fb}^{-1}}$. The event yields are extracted from fits to the distributions of the difference between expected and observed $B$ meson energy to separate signal and background, and are efficiency-corrected as a function of the invariant mass of the $K^-K_S^0$ system. We find the branching fractions to be: \[ \text{B}(B^-\to D^0K^-K_S^0)=(1.89\pm 0.16\pm 0.10)\times 10^{-4}, \] \[ \text{B}(\overline B{}^0\to D^+K^-K_S^0)=(0.85\pm 0.11\pm 0.05)\times 10^{-4},\] \[ \text{B}(B^-\to D^{*0}K^-K_S^0)=(1.57\pm 0.27\pm 0.12)\times 10^{-4}, \] \[ \text{B}(\overline B{}^0\to D^{*+}K^-K_S^0)=(0.96\pm 0.18\pm 0.06)\times 10^{-4},\] where the first uncertainty is statistical and the second systematic. These results include the first observation of $\overline B{}^0\to D^+K^-K_S^0$, $B^-\to D^{*0}K^-K_S^0$, and $\overline B{}^0\to D^{*+}K^-K_S^0$ decays and a significant improvement in the precision of $\text{B}(B^-\to D^0K^-K_S^0)$ compared to previous measurements.
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Submitted 2 May, 2023;
originally announced May 2023.
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Novel method for the identification of the production flavor of neutral charmed mesons
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
M. Aversano,
V. Babu,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker,
P. K. Behera
, et al. (374 additional authors not shown)
Abstract:
We propose a new algorithm for the identification of the production flavor of neutral $D$ mesons in the Belle II experiment. The algorithm exploits the correlation between the flavor of a reconstructed neutral $D$ meson (signal $D$ meson) and the electric charges of particles reconstructed in the rest of the $e^+e^-\to c \bar{c}$ event. These include those originating from the decay of the other c…
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We propose a new algorithm for the identification of the production flavor of neutral $D$ mesons in the Belle II experiment. The algorithm exploits the correlation between the flavor of a reconstructed neutral $D$ meson (signal $D$ meson) and the electric charges of particles reconstructed in the rest of the $e^+e^-\to c \bar{c}$ event. These include those originating from the decay of the other charm hadron produced in the event, as well as those possibly produced in association with the signal $D$ meson. We develop the algorithm using simulation and calibrate it in data using decay modes that identify the flavor of the decaying neutral $D$ meson. We use a data sample of $e^+e^-$ collisions, corresponding to $362\,\mathrm{fb}^{-1}$ of integrated luminosity, collected by Belle II at center-of-mass energies near the $Υ(4S)$ mass. The effective tagging efficiency in data is $(47.91 \pm 0.07 \mathrm{(stat)} \pm 0.51 \mathrm{(syst)})\%$, independent of the neutral-$D$-meson decay mode. This charm flavor tagger will approximately double the effective sample size of many $CP$-violation and charm-mixing measurements that so far have exclusively relied on neutral $D$ mesons originating from $D^{*\pm}$ decays. While developed for Belle II, the basic principles underlying the charm flavor tagger can be used in other experiments, including those at hadron colliders.
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Submitted 6 April, 2023; v1 submitted 4 April, 2023;
originally announced April 2023.
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First Simultaneous Determination of Inclusive and Exclusive $\left|V_{ub}\right|$
Authors:
Belle Collaboration,
L. Cao,
F. Bernlochner,
K. Tackmann,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
T. Aushev,
R. Ayad,
V. Babu,
S. Bahinipati,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
B. Bhuyan,
T. Bilka,
D. Biswas,
A. Bobrov,
D. Bodrov,
J. Borah,
A. Bozek
, et al. (189 additional authors not shown)
Abstract:
The first simultaneous determination of the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element $V_{ub}$ using inclusive and exclusive decays is performed with the full Belle data set at the $Υ(4S)$ resonance, corresponding to an integrated luminosity of 711 fb${}^{-1}$. We analyze collision events in which one $B$ meson is fully reconstructed in hadronic modes. This allows for the reco…
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The first simultaneous determination of the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element $V_{ub}$ using inclusive and exclusive decays is performed with the full Belle data set at the $Υ(4S)$ resonance, corresponding to an integrated luminosity of 711 fb${}^{-1}$. We analyze collision events in which one $B$ meson is fully reconstructed in hadronic modes. This allows for the reconstruction of the hadronic $X_u$ system of the semileptonic $b \to u \ell \bar ν_\ell$ decay. We separate exclusive $B \to π\, \ell\, \bar ν_{\ell}$ decays from other inclusive $B \to X_u \, \ell\, \bar ν_{\ell}$ and backgrounds with a two-dimensional fit, that utilizes the number of charged pions in the $X_u$ system and the four-momentum transfer $q^2$ between the $B$ and $X_u$ system. Combining our measurement with information from lattice QCD and QCD calculations of the inclusive partial rate as well as external experimental information on the shape of the $B \to π\, \ell\, \bar ν_{\ell}$ form factor, we determine $\left|V_{ub}^{\mathrm{excl.}} \right| = (3.78 \pm 0.23 \pm 0.16 \pm 0.14)\times 10^{-3}$ and $\left|V_{ub}^{\mathrm{incl.}} \right| = (3.88 \pm 0.20 \pm 0.31 \pm 0.09)\times 10^{-3}$, respectively, with the uncertainties being the statistical error, systematic errors, and theory errors. The ratio of $\left|V_{ub}^{\mathrm{excl.}} \right| / \left|V_{ub}^{\mathrm{incl.}} \right| = 0.97 \pm 0.12$ is compatible with unity.
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Submitted 16 August, 2023; v1 submitted 30 March, 2023;
originally announced March 2023.
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Study of the muon decay-in-flight in the $τ^-\toμ^-\barν_μν_τ$ decay to measure the Michel parameter $ξ^\prime$
Authors:
Belle Collaboration,
D. Bodrov,
P. Pakhlov,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
B. Bhuyan,
T. Bilka,
D. Biswas,
A. Bobrov,
A. Bondar,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini
, et al. (170 additional authors not shown)
Abstract:
We present the first measurement of the Michel parameter $ξ^\prime$ in the $τ^-\toμ^-\barν_μν_τ$ decay using the full data sample of $988\,\text{fb}^{-1}$ collected by the Belle detector operating at the KEKB asymmetric energy $e^+ e^-$ collider. The method is based on the reconstruction of the $μ^- \to e^- \barν_eν_μ$ decay-in-flight in the Belle central drift chamber and relies on the correlatio…
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We present the first measurement of the Michel parameter $ξ^\prime$ in the $τ^-\toμ^-\barν_μν_τ$ decay using the full data sample of $988\,\text{fb}^{-1}$ collected by the Belle detector operating at the KEKB asymmetric energy $e^+ e^-$ collider. The method is based on the reconstruction of the $μ^- \to e^- \barν_eν_μ$ decay-in-flight in the Belle central drift chamber and relies on the correlation between muon spin and its daughter electron momentum. We study the main sources of the background that can imitate the signal decay, such as kaon and pion decays-in-flight and charged particle scattering on the detector material. Highly efficient methods of their suppression are developed and applied to select 165 signal-candidate events. We obtain $ξ^\prime=0.22\pm0.94\pm0.42$ where the first uncertainty is statistical, and the second one is systematic. The result is in agreement with the Standard Model prediction of $ξ^\prime=1$.
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Submitted 12 July, 2023; v1 submitted 19 March, 2023;
originally announced March 2023.
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First measurement of the Michel parameter $ξ^\prime$ in the $τ^-\toμ^-\barν_μν_τ$ decay at Belle
Authors:
Belle Collaboration,
D. Bodrov,
P. Pakhlov,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
B. Bhuyan,
T. Bilka,
D. Biswas,
A. Bobrov,
A. Bondar,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini
, et al. (169 additional authors not shown)
Abstract:
We report the first measurement of the Michel parameter $ξ^\prime$ in the $τ^-\toμ^-\barν_μν_τ$ decay with a new method proposed just recently. The measurement is based on the reconstruction of the $τ^-\toμ^-\barν_μν_τ$ events with subsequent muon decay-in-flight in the Belle central drift chamber. The analyzed data sample of $988\,\text{fb}^{-1}$ collected by the Belle detector corresponds to app…
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We report the first measurement of the Michel parameter $ξ^\prime$ in the $τ^-\toμ^-\barν_μν_τ$ decay with a new method proposed just recently. The measurement is based on the reconstruction of the $τ^-\toμ^-\barν_μν_τ$ events with subsequent muon decay-in-flight in the Belle central drift chamber. The analyzed data sample of $988\,\text{fb}^{-1}$ collected by the Belle detector corresponds to approximately $912\times10^6$ $τ^+ τ^-$ pairs. We measure $ξ^\prime=0.22\pm0.94(\text{stat})\pm0.42(\text{syst})$, which is in agreement with the standard model prediction of $ξ^\prime=1$. Statistical uncertainty dominates in this study, being a limiting factor, while systematic uncertainty is well under control. Our analysis proved the practicability of this promising method and its prospects for further precise measurement in future experiments.
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Submitted 12 July, 2023; v1 submitted 19 March, 2023;
originally announced March 2023.
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Measurement of decay-time-dependent $\textit{CP}$ violation in $B^0 \to J/ψK^0_S$ decays using 2019-2021 Belle II data
Authors:
Belle II Collaboration,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker,
J. V. Bennett,
E. Bernieri
, et al. (370 additional authors not shown)
Abstract:
We report a measurement of the mixing-induced and direct $\textit{CP}$ violation parameters $S_{\text{CP}}$ and $A_{\text{CP}}$ from $B^0 \to J/ψK^0_S$ decays reconstructed by the Belle II experiment at the SuperKEKB asymmetric-energy electron-positron collider. The data, collected at the center-of-mass energy of the $Υ(4S)$ resonance, correspond to $190\text{fb}^{-1}$ of integrated luminosity. We…
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We report a measurement of the mixing-induced and direct $\textit{CP}$ violation parameters $S_{\text{CP}}$ and $A_{\text{CP}}$ from $B^0 \to J/ψK^0_S$ decays reconstructed by the Belle II experiment at the SuperKEKB asymmetric-energy electron-positron collider. The data, collected at the center-of-mass energy of the $Υ(4S)$ resonance, correspond to $190\text{fb}^{-1}$ of integrated luminosity. We measure ${S_{\text{CP}} = 0.720\pm0.062\pm0.016}$ and $A_{\text{CP}} = 0.094\pm0.044^{+0.042}_{-0.017}$, where the first uncertainties are statistical and the second systematic. In the Standard Model, $S_{\text{CP}}$ equals $\sin(2φ_1)$ to a good approximation.
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Submitted 24 February, 2023;
originally announced February 2023.
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Measurement of the $B^0$ lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019-2021 Belle II data
Authors:
Belle II Collaboration,
F. Abudinén,
I. Adachi,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker,
J. V. Bennett
, et al. (371 additional authors not shown)
Abstract:
We measure the $B^0$ lifetime and flavor-oscillation frequency using $B^0\to D^{(*)-}π^+$ decays collected by the Belle II experiment in asymmetric-energy $e^+e^-$ collisions produced by the SuperKEKB collider operating at the $Υ(4S)$ resonance. We fit the decay-time distribution of signal decays, where the initial flavor is determined by identifying the flavor of the other $B$ meson in the event.…
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We measure the $B^0$ lifetime and flavor-oscillation frequency using $B^0\to D^{(*)-}π^+$ decays collected by the Belle II experiment in asymmetric-energy $e^+e^-$ collisions produced by the SuperKEKB collider operating at the $Υ(4S)$ resonance. We fit the decay-time distribution of signal decays, where the initial flavor is determined by identifying the flavor of the other $B$ meson in the event. The results, based on $33000$ signal decays reconstructed in a data sample corresponding to ${190}\text{fb}^{-1}$, are $τ_{B^0} = {1.499}\pm{0.013}\pm{0.008}\;\text{ps}$, $Δm_d = {0.516}\pm{0.008}\pm{0.005}\;\text{ps}^{-1}$, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.
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Submitted 27 February, 2023; v1 submitted 24 February, 2023;
originally announced February 2023.
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Study of the lineshape of $X(3872)$ using $B$ decays to $D^0\overline{D}{}^{*0}K$
Authors:
Belle Collaboration,
H. Hirata,
T. Iijima,
Y. Kato,
K. Tanida,
I. Adachi,
J. K. Ahn,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
B. Bhuyan,
T. Bilka,
D. Biswas,
A. Bobrov,
D. Bodrov
, et al. (188 additional authors not shown)
Abstract:
We present a study of the $X(3872)$ lineshape in the decay $B \to X(3872)K\to D^0\overline{D}{}^{*0}K$ using a data sample of $772\times 10^6$ $B\overline{B}$ pairs collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The peak near the threshold in the $D^0\overline{D}{}^{*0}$ invariant mass spectrum is fitted using a relativistic Breit-Wigner…
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We present a study of the $X(3872)$ lineshape in the decay $B \to X(3872)K\to D^0\overline{D}{}^{*0}K$ using a data sample of $772\times 10^6$ $B\overline{B}$ pairs collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The peak near the threshold in the $D^0\overline{D}{}^{*0}$ invariant mass spectrum is fitted using a relativistic Breit-Wigner lineshape. We determine the mass and width parameters to be $m = 3873.71 ^{+0.56}_{-0.50} ({\rm stat}) \pm0.13 ({\rm syst}) ~{\rm MeV}/c^2$ and $Γ_0 = 5.2 ^{+2.2}_{-1.5} ({\rm stat}) \pm 0.4 ({\rm syst})~{\rm MeV}$, respectively. The branching fraction is found to be ${\cal B} (B^+\to X(3872)K^+) \times {\cal{B}}(X(3872) \to D^0\overline{D}{}^{*0}) = (0.97 ^{+0.21}_{-0.18} ({\rm stat}) \pm 0.10 ({\rm syst})) \times 10^{-4}$. The signal from $B^0$ decays is observed for the first time with $5.2σ$ significance, and the ratio of branching fractions between charged and neutral $B$ decays is measured to be ${\cal B}(B^0\to X(3872)K^0)/{\cal B}(B^+ \to X(3872)K^+) = 1.34^{+0.47}_{-0.40} ({\rm stat}) ^{+0.10}_{-0.12} ({\rm syst})$. The peak is also studied using a Flatté lineshape. We determine the lower limit on the $D\overline{D}{}^{*}$ coupling constant $g$ to be $0.075$ at 95% credibility in the parameter region where the ratio of $g$ to the mass difference from the $D^0\overline{D}{}^{*0}$ threshold is equal to $-15.11~{\rm GeV}^{-1}$, as measured by LHCb.
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Submitted 17 June, 2023; v1 submitted 4 February, 2023;
originally announced February 2023.
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Charge collection and efficiency measurements of the TJ-Monopix2 DMAPS in 180$\,$nm CMOS technology
Authors:
Christian Bespin,
Ivan Caicedo,
Jochen Dingfelder,
Tomasz Hemperek,
Toko Hirono,
Fabian Hügging,
Hans Krüger,
Konstantinos Moustakas,
Heinz Pernegger,
Petra Riedler,
Lars Schall,
Walter Snoeys,
Norbert Wermes
Abstract:
Monolithic CMOS pixel detectors have emerged as competitive contenders in the field of high-energy particle physics detectors. By utilizing commercial processes they offer high-volume production of such detectors. A series of prototypes has been designed in a 180$\,$nm Tower process with depletion of the sensor material and a column-drain readout architecture. The latest iteration, TJ-Monopix2, fe…
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Monolithic CMOS pixel detectors have emerged as competitive contenders in the field of high-energy particle physics detectors. By utilizing commercial processes they offer high-volume production of such detectors. A series of prototypes has been designed in a 180$\,$nm Tower process with depletion of the sensor material and a column-drain readout architecture. The latest iteration, TJ-Monopix2, features a large 2$\,$cm x 2$\,$cm matrix consisting of 512 x 512 pixels with 33.04$\,$um pitch. A small collection electrode design aims at low power consumption and low noise while the radiation tolerance for high-energy particle detector applications needs extra attention. With a goal to reach radiation tolerance to levels of $10^{15}\,1\,$MeV n$_\text{eq}\,$cm$^{-2}$ of NIEL damage a modification of the standard process has been implemented by adding a low-dosed n-type silicon implant across the pixel in order to allow for homogeneous depletion of the sensor volume. Recent lab measurements and beam tests were conducted for unirradiated modules to study electrical characteristics and hit detection efficiency.
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Submitted 31 January, 2023;
originally announced January 2023.
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Search for $B{}^0_s \rightarrow \ell^{\mp} τ^{\pm}$ with the Semi-leptonic Tagging Method at Belle
Authors:
Belle Collaboration,
L. Nayak,
S. Nishida,
A. Giri,
I. Adachi,
H. Aihara,
D. M. Asner,
H. Atmacan,
V. Aulchenko,
T. Aushev,
R. Ayad,
V. Babu,
S. Bahinipati,
Sw. Banerjee,
M. Bauer,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
B. Bhuyan,
D. Biswas,
D. Bodrov,
J. Borah,
A. Bozek,
M. Bračko
, et al. (167 additional authors not shown)
Abstract:
We present a search for the lepton-flavor-violating decays $B{}^0_s \rightarrow \ell^{\mp}τ^{\pm}$, where $\ell = e, μ$, using the full data sample of $121~\mathrm{fb}^{-1}$ collected at the $Υ(5S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We use $B{}^0_s \overline{B}{}^0_s$ events in which one $B{}^0_s$ meson is reconstructed in a semileptonic decay mode…
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We present a search for the lepton-flavor-violating decays $B{}^0_s \rightarrow \ell^{\mp}τ^{\pm}$, where $\ell = e, μ$, using the full data sample of $121~\mathrm{fb}^{-1}$ collected at the $Υ(5S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We use $B{}^0_s \overline{B}{}^0_s$ events in which one $B{}^0_s$ meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for $B{}^0_s \rightarrow \ell^{\mp}τ^{\pm}$ decays and set upper limits on their branching fractions at $90\%$ confidence level as $\mathcal{B}(B{}^0_s \rightarrow e^{\mp}τ^{\pm}) < 14 \times 10^{-4}$ and $\mathcal{B}(B{}^0_s \rightarrow μ^{\mp}τ^{\pm}) < 7.3 \times 10^{-4}$. Our result represents the first upper limit on the $B{}^0_s \rightarrow e^{\mp}τ^{\pm}$ decay rate.
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Submitted 5 September, 2023; v1 submitted 26 January, 2023;
originally announced January 2023.
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First measurement of the Q^2 distribution of X(3915) single-tag two-photon production
Authors:
Belle Collaboration,
Y. Teramoto,
S. Uehara,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
T. Aushev,
R. Ayad,
V. Babu,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
T. Bilka,
D. Biswas,
D. Bodrov,
J. Borah,
A. Bozek,
M. Bračko,
P. Branchini,
T. E. Browder,
A. Budano
, et al. (181 additional authors not shown)
Abstract:
We report the first measurement of the $Q^2$ distribution of $X(3915)$ produced by single-tag two-photon interactions. The decay mode used is $X(3915) \rightarrow J/ψω$. The covered $Q^2$ region is from 1.5 (GeV/$c$)$^2$ to 10.0 (GeV/$c$)$^2$. We observe $7.9\pm 3.1({\rm stat.})\pm 1.5({\rm syst.})$ events, where we expect $4.1\pm 0.7$ events based on the $Q^2=0$ result from the no-tag two-photon…
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We report the first measurement of the $Q^2$ distribution of $X(3915)$ produced by single-tag two-photon interactions. The decay mode used is $X(3915) \rightarrow J/ψω$. The covered $Q^2$ region is from 1.5 (GeV/$c$)$^2$ to 10.0 (GeV/$c$)$^2$. We observe $7.9\pm 3.1({\rm stat.})\pm 1.5({\rm syst.})$ events, where we expect $4.1\pm 0.7$ events based on the $Q^2=0$ result from the no-tag two-photon process, extrapolated to higher $Q^2$ region using the $c\bar{c}$ model of Schuler, Berends, and van Gulik. The shape of the distribution is also consistent with this model; we note that statistical uncertainties are large.
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Submitted 15 July, 2023; v1 submitted 16 January, 2023;
originally announced January 2023.
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Search for the decay $B^0_s \rightarrow π^0 π^0$ at Belle
Authors:
Belle Collaboration,
J. Borah,
B. Bhuyan,
I. Adachi,
H. Aihara,
D. M. Asner,
V. Aulchenko,
T. Aushev,
R. Ayad,
V. Babu,
S. Bahinipati,
Sw. Banerjee,
P. Behera,
K. Belous,
J. Bennett,
M. Bessner,
V. Bhardwaj,
T. Bilka,
D. Biswas,
D. Bodrov,
A. Bozek,
M. Bračko,
P. Branchini,
T. E. Browder,
A. Budano
, et al. (189 additional authors not shown)
Abstract:
We report the results of the first search for the decay $B_s^0\rightarrowπ^0π^0$ using $121.4\ \rm fb^{-1}$ of data collected at the $Υ(5\rm S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We observe no signal and set a 90\% confidence level upper limit of $7.7\times 10^{-6}$ on the $B_s^0\rightarrowπ^0π^0$ decay branching fraction.
We report the results of the first search for the decay $B_s^0\rightarrowπ^0π^0$ using $121.4\ \rm fb^{-1}$ of data collected at the $Υ(5\rm S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We observe no signal and set a 90\% confidence level upper limit of $7.7\times 10^{-6}$ on the $B_s^0\rightarrowπ^0π^0$ decay branching fraction.
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Submitted 20 January, 2023;
originally announced January 2023.
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A test of light-lepton universality in the rates of inclusive semileptonic $B$-meson decays at Belle II
Authors:
Belle II Collaboration,
L. Aggarwal,
H. Ahmed,
H. Aihara,
N. Akopov,
A. Aloisio,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
T. Aushev,
V. Aushev,
H. Bae,
S. Bahinipati,
P. Bambade,
Sw. Banerjee,
S. Bansal,
M. Barrett,
J. Baudot,
M. Bauer,
A. Baur,
A. Beaubien,
J. Becker,
J. V. Bennett,
E. Bernieri,
F. U. Bernlochner
, et al. (327 additional authors not shown)
Abstract:
We present the first measurement of the ratio of branching fractions of inclusive semileptonic $B$-meson decays, $R(X_{e/μ}) = \mathcal{B}(B\to X \, e \, ν) / \mathcal{B}(B\to X \, μ\, ν)$, a precision test of electron-muon universality, using data corresponding to $189\,\mathrm{fb}^{-1}$ from electron-positron collisions collected with the Belle II detector. In events where the partner $B$ meson…
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We present the first measurement of the ratio of branching fractions of inclusive semileptonic $B$-meson decays, $R(X_{e/μ}) = \mathcal{B}(B\to X \, e \, ν) / \mathcal{B}(B\to X \, μ\, ν)$, a precision test of electron-muon universality, using data corresponding to $189\,\mathrm{fb}^{-1}$ from electron-positron collisions collected with the Belle II detector. In events where the partner $B$ meson is fully reconstructed, we use fits to the lepton momentum spectra above $1.3\,\mathrm{GeV}/c$ to obtain $R(X_{e/μ}) = 1.007 \pm 0.009~(\mathrm{stat}) \pm 0.019~(\mathrm{syst})$, which is the most precise lepton-universality test of its kind and agrees with the standard-model expectation.
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Submitted 25 May, 2023; v1 submitted 19 January, 2023;
originally announced January 2023.
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Measurement of Differential Distributions of $B \to D^* \ell \bar ν_\ell$ and Implications on $|V_{cb}|$
Authors:
Belle Collaboration,
M. T. Prim,
F. Bernlochner,
F. Metzner,
K. Lieret,
T. Kuhr,
I. Adachi,
H. Aihara,
S. Al Said,
D. M. Asner,
H. Atmacan,
V. Aulchenko,
T. Aushev,
R. Ayad,
V. Babu,
S. Bahinipati,
Sw. Banerjee,
M. Bauer,
P. Behera,
J. Bennett,
M. Bessner,
V. Bhardwaj,
B. Bhuyan,
T. Bilka,
D. Biswas
, et al. (190 additional authors not shown)
Abstract:
We present a measurement of the differential shapes of exclusive $B\to D^* \ell \barν_\ell$ ($B = B^-, \bar{B}^0 $ and $\ell = e, μ$) decays with hadronic tag-side reconstruction for the full Belle data set of $711\,\mathrm{fb}^{-1}$ integrated luminosity. We extract the Caprini-Lellouch-Neubert (CLN) and Boyd-Grinstein-Lebed (BGL) form factor parameters and use an external input for the absolute…
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We present a measurement of the differential shapes of exclusive $B\to D^* \ell \barν_\ell$ ($B = B^-, \bar{B}^0 $ and $\ell = e, μ$) decays with hadronic tag-side reconstruction for the full Belle data set of $711\,\mathrm{fb}^{-1}$ integrated luminosity. We extract the Caprini-Lellouch-Neubert (CLN) and Boyd-Grinstein-Lebed (BGL) form factor parameters and use an external input for the absolute branching fractions to determine the Cabibbo-Kobayashi-Maskawa matrix element and find $|V_{cb}|_\mathrm{CLN} = (40.1\pm0.9)\times 10^{-3}$ and $|V_{cb}|_\mathrm{BGL} = (40.6\pm 0.9)\times 10^{-3}$ with the zero-recoil lattice QCD point $\mathcal{F}(1) = 0.906 \pm 0.013$. We also perform a study of the impact of preliminary beyond zero-recoil lattice QCD calculations on the $|V_{cb}|$ determinations. Additionally, we present the lepton flavor universality ratio $R_{eμ} = \mathcal{B}(B \to D^* e \barν_e) / \mathcal{B}(B \to D^* μ\barν_μ) = 0.990 \pm 0.021 \pm 0.023$, the electron and muon forward-backward asymmetry and their difference $ΔA_{FB}=0.022\pm0.026\pm 0.007$, and the electron and muon $D^*$ longitudinal polarization fraction and their difference $ΔF_L^{D^*} = 0.034 \pm 0.024 \pm 0.007$. The uncertainties quoted correspond to the statistical and systematic uncertainties, respectively.
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Submitted 18 January, 2023;
originally announced January 2023.
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Measurement of the $B^{0} \rightarrow D^{*-} \ell^{+} ν_{\ell}$ branching ratio and $|V_{cb}|$ with a fully reconstructed accompanying $B$ meson in 2019-2021 Belle II data
Authors:
F. Abudinén,
I. Adachi,
K. Adamczyk,
L. Aggarwal,
P. Ahlburg,
H. Ahmed,
J. K. Ahn,
H. Aihara,
N. Akopov,
A. Aloisio,
F. Ameli,
L. Andricek,
N. Anh Ky,
D. M. Asner,
H. Atmacan,
V. Aulchenko,
T. Aushev,
V. Aushev,
T. Aziz,
V. Babu,
H. Bae,
S. Baehr,
S. Bahinipati,
A. M. Bakich,
P. Bambade
, et al. (561 additional authors not shown)
Abstract:
We present a measurement of the $B^{0} \rightarrow D^{*-} \ell^{+} ν_{\ell}$ ($\ell=e,μ$) branching ratio and of the CKM parameter $|V_{cb}|$ using signal decays accompanied by a fully reconstructed $B$ meson. The Belle II data set of electron-positron collisions at the $Υ(4S)$ resonance, corresponding to 189.3$\,$fb$^{-1}$ of integrated luminosity, is analyzed. With the Caprini-Lellouch-Neubert f…
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We present a measurement of the $B^{0} \rightarrow D^{*-} \ell^{+} ν_{\ell}$ ($\ell=e,μ$) branching ratio and of the CKM parameter $|V_{cb}|$ using signal decays accompanied by a fully reconstructed $B$ meson. The Belle II data set of electron-positron collisions at the $Υ(4S)$ resonance, corresponding to 189.3$\,$fb$^{-1}$ of integrated luminosity, is analyzed. With the Caprini-Lellouch-Neubert form factor parameterization, the parameters $η_{\rm EW} F(1) |V_{cb}|$ and $ρ^{2}$ are extracted, where $η_{\rm EW}$ is an electroweak correction, $F(1)$ is a normalization factor and $ρ^{2}$ is a form factor shape parameter. We reconstruct 516 signal decays and thereby obtain $\mathcal{B} (B^{0} \rightarrow D^{*-} \ell^{+} ν_{\ell} ) = \left(5.27 \pm 0.22~\rm{\left(stat\right)} \pm 0.38~\rm{\left(syst\right)}\right) \%$, $η_{EW} F(1) |V_{cb}| \times 10^{3} = 34.6 \pm 1.8~\rm{\left(stat\right)} \pm 1.7~\rm{\left(syst\right)}$, and $ρ^{2} = 0.94 \pm 0.18~\rm{\left(stat\right)} \pm 0.11~\rm{\left(syst\right)}$.
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Submitted 11 January, 2023;
originally announced January 2023.