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 2021/02
形態種別 その他
標題 Measurements of the branching fractions of $Λ_c^+ \to p η$ and $Λ_c^+ \to p π^0$ decays at Belle
執筆形態 その他
著者・共著者 Belle Collaboration,S. X. Li,C. P. Shen,I. Adachi,J. K. Ahn,H. Aihara,D. M. Asner,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,P. Behera,J. Bennett,F. Bernlochner,M. Bessner,V. Bhardwaj,B. Bhuyan,T. Bilka,J. Biswal,A. Bobrov,A. Bozek,M. Bracko,T. E. Browder,M. Campajola,L. Cao,D. Červenkov,M. -C. Chang,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,S. Das,N. Dash,G. De Nardo,R. Dhamija,F. Di Capua,Z. Doležal,T. V. Dong,S. Eidelman,D. Epifanov,T. Ferber,D.
概要 We report measurements of the branching fractions of singly
Cabibbo-suppressed decays $\Lambda_c^+ \to p \eta$ and $\Lambda_c^+ \to p
\pi^0$ using the full Belle data sample corresponding to an integrated
luminosity of 980.6 $\rm fb^{-1}$. The data were collected by the Belle
detector at the KEKB $e^{+}$$e^{-}$ asymmetric-energy collider. A clear
$\Lambda_c^+$ signal is seen in the invariant mass distribution of $p \eta$.
The signal yield of the $\Lambda_c^+ \to p \eta$ process is $7734 \pm 263$;
from this, we measure the ratio of branching fractions ${\cal B}(\Lambda_c^+
\to p \eta)/{\cal B}(\Lambda_c^+ \to p K^- \pi^+) = (2.258 \pm 0. 077(\rm stat.
) \pm 0.136(\rm syst. ))\times 10^{-2}$, from which we infer the branching
fraction ${\cal B}(\Lambda_c^+ \to p \eta) = (1.42 \pm 0.05(\rm stat.) \pm
0.11(\rm syst.)) \times 10^{-3}$. In addition, no significant signal for
$\Lambda_c^+ \to p \pi^0$ is found so an upper limit on the branching fraction
of ${\cal B}(\Lambda_c^+ \to p \pi^0)<8.0 \times 10^{-5}$ at 90\% credibility
level is set, more than three times better than the best current upper limit.
DOI 10.1103/PhysRevD.103.072004
PermalinkURL http://arxiv.org/abs/2102.12226v2
researchmap用URL http://arxiv.org/pdf/2102.12226v2