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 2020/09
形態種別 その他
標題 Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II data
執筆形態 その他
著者・共著者 Belle II Collaboration,F. Abudinén,I. Adachi,R. Adak,K. Adamczyk,P. Ahlburg,J. K. Ahn,H. Aihara,N. Akopov,A. Aloisio,F. Ameli,L. Andricek,N. Anh Ky,D. M. Asner,H. Atmacan,V. Aulchenko,T. Aushev,V. Aushev,T. Aziz,V. Babu,S. Bacher,S. Baehr,S. Bahinipati,A. M. Bakich,P. Bambade,Sw. Banerjee,S. Bansal,M. Barrett,G. Batignani,J. Baudot,A. Beaulieu,J. Becker,P. K. Behera,M. Bender,J. V. Bennett,E. Bernieri,F. U. Bernlochner,M. Bertemes,M. Bessner,S. Bettarini,V. Bhardwaj,B. Bhuyan,F. Bianchi,T. Bilka
概要 We report on first measurements of branching fractions~($\mathcal{B}$) and
CP-violating charge asymmetries~($\mathcal{A}$) in charmless $B$ decays at
Belle~II. We use a sample of electron-positron collisions collected in 2019 and
2020 at the $\Upsilon(4S)$ resonance and corresponding to $34.6$\,fb$^{-1}$ of
integrated luminosity. We use simulation to determine optimized event
selections. The $\Delta E$ distributions of the resulting samples, restricted
in $M_{\rm bc}$, are fit to determine signal yields. Signal yields are
corrected for efficiencies determined from simulation and control data samples
to obtain branching fractions and CP-violating asymmetries for flavour-specific
channels. These are the first measurements in charmless decays reported by
Belle~II. Results are compatible with known determinations and show detector
performance comparable with the best Belle results offering a reliable basis to
assess projections for future reach.
PermalinkURL http://arxiv.org/abs/2009.09452v1
researchmap用URL http://arxiv.org/pdf/2009.09452v1