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Measurement of the $B^{+} / B^{0}$ production ratio in $e^{+} e^{-}$ collisions at the $ϒ (4 S)$ resonance using $B \to J / ψ (ℓ ℓ) K$ decays at Belle

S. Choudhury , S. Sandilya , K. Trabelsi , A. Giri , I. Adachi , H. Aihara , D. M. Asner , H. Atmacan , T. Aushev et al. (Belle Collaboration)

T. Aushev , R. Ayad , V. Babu , S. Bahinipati , P. Behera , K. Belous , J. Bennett , M. Bessner , V. Bhardwaj , B. Bhuyan , T. Bilka , D. Bodrov , G. Bonvicini , J. Borah , A. Bozek , M. Bračko , P. Branchini , T. E. Browder , A. Budano , M. Campajola , D. Červenkov , M.-C. Chang , C. Chen , B. G. Cheon , K. Chilikin , H. E. Cho , K. Cho , S.-J. Cho , S.-K. Choi , Y. Choi , D. Cinabro , S. Das , G. De Pietro , F. Di Capua , J. Dingfelder , Z. Doležal , T. V. Dong , D. Epifanov , D. Ferlewicz , B. G. Fulsom , R. Garg , V. Gaur , N. Gabyshev , P. Goldenzweig , E. Graziani , T. Gu , K. Gudkova , C. Hadjivasiliou , T. Hara , K. Hayasaka , H. Hayashii , M. T. Hedges , D. Herrmann , W.-S. Hou , C.-L. Hsu , K. Inami , N. Ipsita , A. Ishikawa , R. Itoh , M. Iwasaki , W. W. Jacobs , E.-J. Jang , Q. P. Ji , S. Jia , Y. Jin , K. K. Joo , K. H. Kang , T. Kawasaki , C. Kiesling , C. H. Kim , D. Y. Kim , K.-H. Kim , Y.-K. Kim , H. Kindo , K. Kinoshita , P. Kodyš , T. Konno , A. Korobov , S. Korpar , E. Kovalenko , P. Križan , P. Krokovny , M. Kumar , R. Kumar , K. Kumara , Y.-J. Kwon , T. Lam , J. S. Lange , M. Laurenza , S. C. Lee , P. Lewis , J. Li , L. K. Li , Y. B. Li , L. Li Gioi , J. Libby , K. Lieret , D. Liventsev , T. Luo , M. Masuda , T. Matsuda , D. Matvienko , S. K. Maurya , F. Meier , M. Merola , F. Metzner , K. Miyabayashi , R. Mizuk , G. B. Mohanty , I. Nakamura , M. Nakao , Z. Natkaniec , A. Natochii , L. Nayak , M. Nayak , N. K. Nisar , S. Nishida , S. Ogawa , H. Ono , P. Oskin , P. Pakhlov , G. Pakhlova , S. Pardi , S.-H. Park , A. Passeri , S. Patra , S. Paul , T. K. Pedlar , R. Pestotnik , L. E. Piilonen , T. Podobnik , S. Prell , E. Prencipe , M. T. Prim , N. Rout , G. Russo , Y. Sakai , A. Sangal , L. Santelj , V. Savinov , G. Schnell , J. Schueler , C. Schwanda , A. J. Schwartz , Y. Seino , K. Senyo , M. E. Sevior , M. Shapkin , C. Sharma , C. P. Shen , J.-G. Shiu , J. B. Singh , A. Sokolov , E. Solovieva , M. Starič , Z. S. Stottler , J. F. Strube , M. Sumihama , T. Sumiyoshi , M. Takizawa , K. Tanida , F. Tenchini , M. Uchida , T. Uglov , Y. Unno , S. Uno , P. Urquijo , Y. Ushiroda , Y. Usov , R. van Tonder , G. Varner , K. E. Varvell , A. Vinokurova , A. Vossen , E. Waheed , E. Wang , M.-Z. Wang , X. L. Wang , M. Watanabe , S. Watanuki , E. Won , X. Xu , B. D. Yabsley , S. B. Yang , J. Yelton , J. H. Yin , C. Z. Yuan , Y. Yusa , Y. Zhai , Z. P. Zhang , V. Zhilich , and V. Zhukova (Belle Collaboration)

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Phys. Rev. D 107, L031102 – Published 22 February, 2023

DOI: https://doi.org/10.1103/PhysRevD.107.L031102

Abstract

We measure the ratio of branching fractions for the $ϒ (4 S)$ decays to $B^{+} B^{-}$ and $B^{0} {\bar{B}}^{0}$ using $B^{+} \to J / ψ (ℓ ℓ) K^{+}$ and $B^{0} \to J / ψ (ℓ ℓ) K^{0}$ samples, where $J / ψ (ℓ ℓ)$ stands for $J / ψ \to ℓ^{+} ℓ^{-}$ ( $ℓ = e$ or $μ$ ), with $711 {fb}^{- 1}$ of data collected at the $ϒ (4 S)$ resonance with the Belle detector. We find the decay rate ratio of $ϒ (4 S) \to B^{+} B^{-}$ over $ϒ (4 S) \to B^{0} {\bar{B}}^{0}$ to be $1.065 \pm 0.012 \pm 0.019 \pm 0.047$ , which is the most precise measurement to date. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainty is due to the assumption of isospin symmetry in $B \to J / ψ (ℓ ℓ) K$ .

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Phys. Rev. D 107, L031102– Published 22 February, 2023

Vol. 107, Iss. 3 — 1 February 2023

Received 6 July 2022
Accepted 23 August 2022

DOI: https://doi.org/10.1103/PhysRevD.107.L031102

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Measurement of the $B^{+} / B^{0}$ production ratio in $e^{+} e^{-}$ collisions at the $ϒ (4 S)$ resonance using $B \to J / ψ (ℓ ℓ) K$ decays at Belle

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Measurement of the B+/B0 production ratio in e+e− collisions at the ϒ(4S) resonance using B→J/ψ(ℓℓ)K decays at Belle

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Measurement of the $B^{+} / B^{0}$ production ratio in $e^{+} e^{-}$ collisions at the $ϒ (4 S)$ resonance using $B \to J / ψ (ℓ ℓ) K$ decays at Belle