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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 | 2019/03 |
| 形態種別 | その他 |
| 標題 | Evidence for $B^+ \rightarrow h_c K^+$ and observation of $η_c(2S) \to p \bar{p} π^+ π^-$ |
| 執筆形態 | その他 |
| 著者・共著者 | Belle Collaboration,K. Chilikin,I. Adachi,D. M. Asner,V. Aulchenko,T. Aushev,R. Ayad,V. Babu,I. Badhrees,V. Bansal,P. Behera,C. Beleño,M. Berger,V. Bhardwaj,T. Bilka,J. Biswal,A. Bobrov,A. Bondar,A. Bozek,M. Bračko,T. E. Browder,M. Campajola,L. Cao,D. Červenkov,V. Chekelian,A. Chen,B. G. Cheon,K. Cho,S. -K. Choi,Y. Choi,D. Cinabro,S. Cunliffe,S. Di Carlo,Z. Doležal,T. V. Dong,S. Eidelman,D. Epifanov,J. E. Fast,T. Ferber,B. G. Fulsom,R. Garg,V. Gaur,N. Gabyshev,A. Garmash,M. Gelb,A. Giri,P. Golde |
| 概要 | A search for the decays $B^+ \rightarrow h_c K^+$ and $B^0 \rightarrow h_c
K_S^0$ is performed. Evidence for the decay $B^+ \rightarrow h_c K^+$ is found; its significance is $4.8\sigma$. No evidence is found for $B^0 \rightarrow h_c K_S^0$. The branching fraction for $B^+ \rightarrow h_c K^+$ is measured to be $(3.7^{+1.0}_{-0.9}{}^{+0.8}_{-0.8}) \times 10^{-5}$; the upper limit for the $B^0 \rightarrow h_c K_S^0$ branching fraction is $1.4 \times 10^{-5}$ at $90\%$ C.L. In addition, a study of the $p \bar{p} \pi^+ \pi^-$ invariant mass distribution in the channel $B^+ \to (p \bar{p} \pi^+ \pi^-) K^+$ results in the first observation of the decay $\eta_c(2S) \to p \bar{p} \pi^+ \pi^-$ with $12.1\sigma$ significance. The analysis is based on the 711 $\mathrm{fb}^{-1}$ data sample collected by the Belle detector at the asymmetric-energy $e^+ e^-$ collider KEKB at the $\Upsilon(4S)$ resonance. |
| DOI | 10.1103/PhysRevD.100.012001 |
| PermalinkURL | http://arxiv.org/abs/1903.06414v2 |
| researchmap用URL | http://arxiv.org/pdf/1903.06414v2 |