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Showing 1–50 of 219 results for author: Dingfelder, J

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  1. arXiv:2403.04340  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 11 March, 2024; v1 submitted 7 March, 2024; originally announced March 2024.

    Report number: Belle Preprint 2024-02, KEK Preprint 2023-54

  2. arXiv:2403.02841  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 5 March, 2024; originally announced March 2024.

    Report number: 2024-007, 2023-55

  3. arXiv:2403.02590  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 4 March, 2024; originally announced March 2024.

    Comments: 10 pages, 5 figures

    Report number: Belle II Preprint 2024-008, KEK Preprint 2023-56

  4. arXiv:2402.12153  [pdf, other

    physics.ins-det

    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… ▽ More

    Submitted 19 February, 2024; originally announced February 2024.

    Comments: Conference proceedings for 13th International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors (HSTD13), submitted to NIM-A

  5. arXiv:2402.03713  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 6 February, 2024; originally announced February 2024.

    Report number: Belle II Preprint 2024-003, KEK Preprint 2023-50

  6. arXiv:2402.02580  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 4 February, 2024; originally announced February 2024.

    Comments: 9 pages, 6 figures

    Report number: Belle Preprint 2023-22, KEK Preprint 2023-44

  7. arXiv:2401.12021  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 22 January, 2024; originally announced January 2024.

  8. arXiv:2401.04807  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 11 January, 2024; v1 submitted 9 January, 2024; originally announced January 2024.

    Comments: 7 pages, 2 figures, submitted to Phys. Rev. Lett

    Report number: Belle Preprint 2024-01, KEK Preprint 2023-48

  9. arXiv:2401.04646  [pdf, ps, other

    hep-ex

    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… ▽ More

    Submitted 9 January, 2024; originally announced January 2024.

    Comments: 7 pages, 1 figure, submitted to Phys. Rev. Lett

    Report number: Belle Preprint 2023-21, KEK Preprint 2023-43, UCHEP-24-01

  10. arXiv:2401.02840  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 5 January, 2024; originally announced January 2024.

    Comments: 16 pages, 17 figures, submitted to PRD

  11. arXiv:2312.13043  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 20 December, 2023; originally announced December 2023.

    Comments: 8 pages, 3 figures, submitted to PRD

    Report number: Belle II Preprint 2023-018, KEK Preprint 2023-36

  12. arXiv:2312.02580  [pdf, ps, other

    hep-ex

    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… ▽ More

    Submitted 5 December, 2023; v1 submitted 5 December, 2023; originally announced December 2023.

    Comments: 8 pages, 4 figures, submitted to PRD

    Report number: Belle Preprint 2023-16 KEK Preprint 2023-29

  13. arXiv:2311.14647  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 1 March, 2024; v1 submitted 24 November, 2023; originally announced November 2023.

    Comments: 29 pages, 23 figures, To appear in PRD

    Report number: Belle II Preprint 2023-017, KEK Preprint 2023-35

  14. arXiv:2311.07248  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 13 November, 2023; originally announced November 2023.

    Report number: Belle II Preprint 2023-016, KEK Preprint 2023-34

  15. arXiv:2311.00458  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 1 November, 2023; originally announced November 2023.

    Comments: 22 pages, 13 figures

    Report number: Belle Preprint 2023-17, KEK Preprint 2023-30

  16. arXiv:2310.15717  [pdf, other

    physics.ins-det

    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… ▽ More

    Submitted 24 October, 2023; originally announced October 2023.

  17. arXiv:2310.07412  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 18 March, 2024; v1 submitted 11 October, 2023; originally announced October 2023.

    Comments: 6 pages, 4 figures, PHYSICAL REVIEW D 109, L031101 (2024)[DOI: : 10.1103/PhysRevD.109.L031101]

    Report number: Belle Preprint: 2023-15, KEK Preprint 2023-20

  18. 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… ▽ More

    Submitted 5 January, 2024; v1 submitted 10 October, 2023; originally announced October 2023.

    Report number: Belle II Preprint 2023-003, KEK Preprint 2022-58

    Journal ref: Phys. Rev. D 109, 012001 (2024)

  19. 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.… ▽ More

    Submitted 4 December, 2023; v1 submitted 2 October, 2023; originally announced October 2023.

    Report number: Belle II Preprint 2023-014, KEK Preprint 2023-28

    Journal ref: Phys.Rev.D 108 (2023) 9, 092013

  20. arXiv:2309.16358   

    physics.ins-det

    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… ▽ More

    Submitted 15 November, 2023; v1 submitted 28 September, 2023; originally announced September 2023.

    Comments: The paper was withdrawn from the publication in JINST journal and will not be published

  21. arXiv:2309.02739  [pdf, other

    hep-ex

    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:… ▽ More

    Submitted 26 February, 2024; v1 submitted 6 September, 2023; originally announced September 2023.

    Comments: 11 pages, 3 figures, Submitted to JHEP

    Report number: Belle Preprint 2023-14, KEK Preprint 2023-19

  22. arXiv:2308.08900  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 21 August, 2023; v1 submitted 17 August, 2023; originally announced August 2023.

    Report number: Belle Preprint 2023-12, KEK Preprint 2023-16

  23. arXiv:2308.05048  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 10 August, 2023; v1 submitted 9 August, 2023; originally announced August 2023.

    Report number: Belle II Preprint 2023-011;KEK Preprint 2023-9

  24. 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… ▽ More

    Submitted 2 November, 2023; v1 submitted 3 August, 2023; originally announced August 2023.

    Report number: Belle II Preprint 2023-013, KEK Preprint 2023-18

    Journal ref: Phys. Rev. Lett. 131, 181801 (Published 31 October 2023)

  25. 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… ▽ More

    Submitted 26 October, 2023; v1 submitted 6 July, 2023; originally announced July 2023.

    Report number: Belle II preprint: 2023-012, KEK preprint: 2023-10

    Journal ref: Phys. Rev. D 108, 072012 (2023)

  26. 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… ▽ More

    Submitted 23 September, 2023; v1 submitted 21 June, 2023; originally announced June 2023.

    Report number: KEK preprint: 2022-32, Belle II preprint: 2022-006

    Journal ref: Phys. Rev. Lett. 131, 121802 (2023)

  27. 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… ▽ More

    Submitted 25 September, 2023; v1 submitted 5 June, 2023; originally announced June 2023.

    Comments: 26 pages, 8 figures

    Report number: Belle II Preprint 2023-010; KEK Preprint 2023-8

    Journal ref: Journal of High Energy Physics 09(2023)146

  28. arXiv:2306.02830  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 5 June, 2023; originally announced June 2023.

    Report number: Belle II Preprint 2023-009, KEK Preprint 2023-7

  29. 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… ▽ More

    Submitted 22 December, 2023; v1 submitted 1 June, 2023; originally announced June 2023.

    Comments: 7 pages, 4 figures, as published in Physical Review Letters

    Report number: Belle Preprint 2023-007, KEK Preprint 2023-5, Univ. Cincinnati preprint UCHEP-23-03

    Journal ref: Phys. Rev. Lett. 131, 171803 (2023)

  30. arXiv:2305.19116  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 30 May, 2023; originally announced May 2023.

    Report number: Belle II Preprint 2023-008, KEK Preprint 2023-6

  31. arXiv:2305.17947  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 7 August, 2023; v1 submitted 29 May, 2023; originally announced May 2023.

    Report number: Belle Preprint 2023-11, KEK Preprint 2023-13

  32. arXiv:2305.12806  [pdf, other

    hep-ex

    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:… ▽ More

    Submitted 22 May, 2023; originally announced May 2023.

    Comments: 10 pages, 5 figures

    Report number: Belle Preprint 2023-07, KEK Preprint 2023-3, UCHEP-23-02

  33. 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… ▽ More

    Submitted 22 November, 2023; v1 submitted 18 May, 2023; originally announced May 2023.

    Report number: Belle Preprint:2023-08, KEK Preprint:2023-4

    Journal ref: Phys. Rev. D 108, L111102, 2023

  34. 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… ▽ More

    Submitted 7 October, 2023; v1 submitted 12 May, 2023; originally announced May 2023.

    Report number: Belle II Preprint 2023-006, KEK Preprint 2023-2

    Journal ref: PRL 131, 111803 (2023)

  35. arXiv:2305.04759  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 16 May, 2023; v1 submitted 8 May, 2023; originally announced May 2023.

    Report number: BELLE2-CONF-2023-004

  36. arXiv:2305.01321  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 2 May, 2023; originally announced May 2023.

    Report number: BELLE2-CONF-2023-003

  37. 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… ▽ More

    Submitted 6 April, 2023; v1 submitted 4 April, 2023; originally announced April 2023.

    Report number: Belle II Preprint 2023-005, KEK Preprint 2023-1

    Journal ref: Phys. Rev. D 107, 112010 (2023)

  38. 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… ▽ More

    Submitted 16 August, 2023; v1 submitted 30 March, 2023; originally announced March 2023.

    Comments: 7 pages, 3 captioned figures, including supplemental material

    Report number: Belle Preprint 2023-04, KEK Preprint 2022-53

    Journal ref: Phys. Rev. Lett. 131, 211801 (2023)

  39. 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… ▽ More

    Submitted 12 July, 2023; v1 submitted 19 March, 2023; originally announced March 2023.

    Comments: 16 pages, 14 figures, published in Phys. Rev. D

    Report number: Belle Preprint 2023-06, KEK Preprint 2022-55

    Journal ref: Phys. Rev. D 108 (2023) 012003

  40. 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… ▽ More

    Submitted 12 July, 2023; v1 submitted 19 March, 2023; originally announced March 2023.

    Comments: 6 pages, 4 figures, published in Phys. Rev. Lett

    Report number: Belle Preprint 2023-05, KEK Preprint 2022-54

    Journal ref: Phys. Rev. Lett. 131 (2023) 021801

  41. 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… ▽ More

    Submitted 24 February, 2023; originally announced February 2023.

  42. 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.… ▽ More

    Submitted 27 February, 2023; v1 submitted 24 February, 2023; originally announced February 2023.

    Report number: Belle II Preprint 2023-001, KEK Preprint 2022-56

  43. 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… ▽ More

    Submitted 17 June, 2023; v1 submitted 4 February, 2023; originally announced February 2023.

    Comments: submitted to Phys. Rev D

    Report number: Belle Preprint 2023-03, KEK Preprint 2022-52

    Journal ref: Phys. Rev. D 107, 112011 (2003)

  44. arXiv:2301.13638  [pdf, other

    physics.ins-det

    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… ▽ More

    Submitted 31 January, 2023; originally announced January 2023.

    Comments: Conference proceedings for PIXEL2022 conference, submitted to PoS

  45. 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… ▽ More

    Submitted 5 September, 2023; v1 submitted 26 January, 2023; originally announced January 2023.

    Comments: 14 pages, 5 figures

    Report number: Belle Preprint 2023-02; KEK Preprint 2022-49

    Journal ref: JHEP08(2023)178

  46. 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… ▽ More

    Submitted 15 July, 2023; v1 submitted 16 January, 2023; originally announced January 2023.

    Comments: 10 pages, 9 figures, 3 tables

    Report number: Belle preprint 2023-01, KEK preprint 2022-48

    Journal ref: Physical Review D 108, 012004 (2023)

  47. 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.

    Submitted 20 January, 2023; originally announced January 2023.

    Report number: Belle Preprint 2022-31, KEK Preprint 2022-42

    Journal ref: Phys.Rev.D 107 (2023) 5, L051101

  48. 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… ▽ More

    Submitted 25 May, 2023; v1 submitted 19 January, 2023; originally announced January 2023.

    Report number: Belle II Preprint 2022-009 KEK Preprint 2022-45

  49. 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… ▽ More

    Submitted 18 January, 2023; originally announced January 2023.

    Report number: Belle Preprint 2022-34; KEK Preprint 2022-47

  50. arXiv:2301.04716  [pdf, other

    hep-ex

    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… ▽ More

    Submitted 11 January, 2023; originally announced January 2023.