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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 | 2024/01 |
| 形態種別 | その他 |
| 標題 | Measurements of the branching fraction, polarization, and $CP$ asymmetry for the decay $B^0\rightarrow ωω$ |
| 執筆形態 | その他 |
| 著者・共著者 | 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,M. Campajola,L. Cao,D. Červenkov,M. -C. Chang,P. Chang,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -K. Choi,Y. Choi,S. Choudhury,S. Das,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong, |
| 概要 | We present a measurement of $B^{0} \rightarrow \omega \omega$, 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 $B^{0} \rightarrow \omega \omega$, and the first measurements of $f_L$ and $A_{CP}$ for this decay. |
| PermalinkURL | http://arxiv.org/abs/2401.04646v1 |
| researchmap用URL | http://arxiv.org/pdf/2401.04646v1 |