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Study of $χ_{b J} (2 P) \to ω ϒ (1 S)$ at Belle

Z. S. Stottler , T. K. Pedlar , B. G. Fulsom , I. Adachi , K. Adamczyk , H. Aihara , S. Al Said , D. M. Asner , H. Atmacan et al. (The Belle Collaboration)

H. Atmacan , T. Aushev , R. Ayad , V. Babu , Sw. Banerjee , M. Bauer , P. Behera , K. Belous , J. Bennett , F. Bernlochner , M. Bessner , T. Bilka , D. Biswas , A. Bobrov , D. Bodrov , G. Bonvicini , J. Borah , A. Bozek , P. Branchini , T. E. Browder , A. Budano , M. Campajola , L. Cao , D. Červenkov , M.-C. Chang , B. G. Cheon , K. Chilikin , H. E. Cho , K. Cho , S.-K. Choi , Y. Choi , S. Choudhury , D. Cinabro , S. Das , G. De Nardo , G. De Pietro , R. Dhamija , F. Di Capua , Z. Doležal , T. V. Dong , S. Dubey , P. Ecker , D. Epifanov , T. Ferber , D. Ferlewicz , V. Gaur , A. Garmash , A. Giri , P. Goldenzweig , E. Graziani , T. Gu , Y. Guan , K. Gudkova , C. Hadjivasiliou , T. Hara , K. Hayasaka , S. Hazra , M. T. Hedges , D. Herrmann , W.-S. Hou , C.-L. Hsu , K. Inami , N. Ipsita , A. Ishikawa , R. Itoh , M. Iwasaki , Y. Iwasaki , W. W. Jacobs , S. Jia , Y. Jin , A. B. Kaliyar , T. Kawasaki , C. Kiesling , C. H. Kim , D. Y. Kim , K.-H. Kim , Y.-K. Kim , P. Kodyš , A. Korobov , S. Korpar , E. Kovalenko , P. Križan , P. Krokovny , T. Kuhr , M. Kumar , R. Kumar , K. Kumara , A. Kuzmin , Y.-J. Kwon , Y.-T. Lai , T. Lam , M. Laurenza , S. C. Lee , D. Levit , P. Lewis , L. K. Li , J. Libby , K. Lieret , D. Liventsev , T. Luo , Y. Ma , M. Masuda , S. K. Maurya , F. Meier , M. Merola , K. Miyabayashi , G. B. Mohanty , I. Nakamura , M. Nakao , A. Natochii , L. Nayak , N. K. Nisar , S. Nishida , K. Ogawa , S. Ogawa , H. Ono , P. Oskin , P. Pakhlov , G. Pakhlova , T. Pang , S. Pardi , J. Park , S.-H. Park , S. Patra , S. Paul , R. Pestotnik , L. E. Piilonen , T. Podobnik , E. Prencipe , M. T. Prim , N. Rout , G. Russo , S. Sandilya , A. Sangal , L. Santelj , V. Savinov , G. Schnell , C. Schwanda , Y. Seino , K. Senyo , W. Shan , M. Shapkin , C. Sharma , J.-G. Shiu , A. Sokolov , E. Solovieva , M. Starič , M. Sumihama , W. Sutcliffe , M. Takizawa , K. Tanida , F. Tenchini , R. Tiwary , M. Uchida , Y. Unno , S. Uno , S. E. Vahsen , G. Varner , D. Wang , E. Wang , M.-Z. Wang , S. Watanuki , O. Werbycka , E. Won , B. D. Yabsley , W. Yan , J. H. Yin , C. Z. Yuan , L. Yuan , Y. Yusa , Z. P. Zhang , V. Zhilich , and V. Zhukova (The Belle Collaboration)

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Phys. Rev. Lett. 135, 121902 – Published 17 September, 2025

DOI: https://doi.org/10.1103/dpb3-l6zc

Abstract

We report a study of the hadronic transitions $χ_{b J} (2 P) \to ω ϒ (1 S)$ , with $ω \to π^{+} π^{-} π^{0}$ , using $28.2 \times 10^{6} ϒ (3 S)$ mesons recorded by the Belle detector. We present the first evidence for the near-threshold transition $χ_{b 0} (2 P) \to ω ϒ (1 S)$ , the analog of the near-threshold charm sector decay $χ_{c 1} (3872) \to ω J / ψ$ , with a branching fraction of $B (χ_{b 0} (2 P) \to ω ϒ (1 S)) = (0.55 \pm 0.19 \pm 0.07) %$ . We also obtain branching fractions of $B (χ_{b 1} (2 P) \to ω ϒ (1 S)) = ({2.39}_{- 0.19}^{+ 0.20} \pm 0.24) %$ and $B (χ_{b 2} (2 P) \to ω ϒ (1 S)) = ({0.47}_{- 0.12}^{+ 0.13} \pm 0.06) %$ , confirming the measurement of the $ω$ transitions of the $J = 1, 2 P$ –wave states. The ratio for the $J = 2$ to $J = 1$ transitions is also measured and found to differ by 3.3 standard deviations from the expected value in the QCD multipole expansion.

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Phys. Rev. Lett. 135, 121902– Published 17 September, 2025

Vol. 135, Iss. 12 — 19 September 2025

Received 5 July 2024
Revised 15 July 2025
Accepted 22 July 2025

DOI: https://doi.org/10.1103/dpb3-l6zc

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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Study of $χ_{b J} (2 P) \to ω ϒ (1 S)$ at Belle

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Study of χbJ(2P)→ωϒ(1S) at Belle

Abstract

Physics Subject Headings (PhySH)

Article Text

References (37)

Study of $χ_{b J} (2 P) \to ω ϒ (1 S)$ at Belle