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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2024/07 |
| 形態種別 | その他 |
| 標題 | Evidence of $h_{b}(\text{2P}) \to Υ(\text{1S})η$ decay and search for $h_{b}(\text{1P,2P}) \to Υ(\text{1S})π^0$ with the Belle detector |
| 執筆形態 | その他 |
| 著者・共著者 | Belle Collaboration,E. Kovalenko,I. Adachi,H. Aihara,D. M. Asner,T. Aushev,R. Ayad,V. Babu,Sw. Banerjee,K. Belous,J. Bennett,M. Bessner,T. Bilka,D. Biswas,A. Bobrov,D. Bodrov,A. Bondar,A. Bozek,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,M. -C. Chang,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,Y. Choi,S. Choudhury,N. Dash,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua,Z. Doležal,T. V. Dong,S. Dubey,P. Ecker,D. Epifanov,D. Ferlewicz,B. G. Fulsom,R. Garg,V. Gau |
| 概要 | We report the first evidence for the $h_{b}(\text{2P}) \to
\Upsilon(\text{1S})\eta$ transition with a significance of $3.5$ standard deviations. The decay branching fraction is measured to be $\mathcal{B}[h_{b}(\text{2P}) \to \Upsilon(\text{1S})\eta]=(7.1 ~^{+3.7} _{-3.2}\pm 0.8)\times10^{-3}$, which is noticeably smaller than expected. We also set upper limits on $\pi^0$ transitions of $\mathcal{B}[h_{b}(\text{2P}) \to \Upsilon(\text{1S})\pi^0] < 1.8\times10^{-3}$, and $\mathcal{B}[h_{b}(\text{1P})\to \Upsilon(\text{1S})\pi^0] < 1.8\times10^{-3}$, at the $90\%$ confidence level. These results are obtained with a $131.4$~fb$^{-1}$ data sample collected near the $\Upsilon(\text{5S})$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. |
| PermalinkURL | http://arxiv.org/abs/2407.03783v1 |
| researchmap用URL | http://arxiv.org/pdf/2407.03783v1 |