新山　雅之
   所属   京都産業大学  理学部 物理科学科
   職種   教授
発行・発表の年月 2019/11
形態種別 その他
査読 査読あり
標題 Measurements of the Branching Fractions ${\cal B}(B^{-} \to \barΛ_{c}^{-} Ξ_{c}^{'0})$, ${\cal B}(B^{-} \to \barΛ_{c}^{-} Ξ_{c}(2645)^{0})$ and ${\cal B}(B^{-} \to \barΛ_{c}^{-} Ξ_{c}(2790)^{0}) $
執筆形態 その他
著者・共著者 Belle Collaboration,Y. Li,Y. B. Li,C. P. Shen,I. Adachi,H. Aihara,D. M. Asner,H. Atmacan,V. Aulchenko,R. Ayad,V. Babu,I. Badhrees,A. M. Bakich,P. Behera,T. Bilka,J. Biswal,A. Bobrov,G. Bonvicini,A. Bozek,M. Bračko,T. E. Browder,M. Campajola,L. Cao,D. Červenkov,P. Chang,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -K. Choi,Y. Choi,D. Cinabro,S. Cunliffe,G. De Nardo,F. Di Capua,S. Di Carlo,Z. Doležal,T. V. Dong,S. Eidelman,J. E. Fast,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. Garg,V. Gaur,N. Ga
概要 Using the data sample of 711 fb$^{-1}$ of $\Upsilon(4S)$ on-resonance data
taken by the Belle detector at the KEKB asymmetric-energy electron-positron
collider, we present the first measurements of branching fractions of the
decays $B^{-} \to \bar{\Lambda}_{c}^{-} \Xi_{c}^{'0}$, $B^{-} \to
\bar{\Lambda}_{c}^{-} \Xi_{c}(2645)^{0}$, and $B^{-} \to \bar{\Lambda}_{c}^{-}
\Xi_{c}(2790)^{0} $. The signal yields for these decays are extracted from the
recoil mass spectrum of the system recoiling against $\bar{\Lambda}_{c}^{-}$
baryons in selected $B^-$ candidates. The branching fraction of $B^{-} \to
\bar{\Lambda}_{c}^{-} \Xi_{c}(2790)^{0}$ is measured to be $ (1.1 \pm 0.4 \pm
0.2)\times 10^{-3}$, where the first uncertainty is statistical and the second
systematic. The 90\% credibility level upper limits on ${\cal B}(B^{-} \to
\bar{\Lambda}_{c}^{-} \Xi_{c}^{'0})$ and ${\cal B}(B^{-} \to
\bar{\Lambda}_{c}^{-} \Xi_{c}(2645)^{0})$ are determined to be $6.5\times
10^{-4}$ and $7.9\times 10^{-4}$, respectively.
DOI 10.1103/PhysRevD.100.112010