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 2021/06
形態種別 その他
標題 Measurements of branching fractions and direct CP asymmetries in $B^{0}\to K^{+} π^{-}$, $B^+ \to K_{\rm S}^0π^+$ and $B^0 \to π^+π^-$ using 2019 and 2020 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,E. Bertholet,M. Bessner,S. Bettarini,V. Bhardwaj,B. Bhuyan,F. Bia
概要 We report updated measurements of branching fractions ($\mathcal{B}$) and
CP-violating charge asymmetries ($\mathcal{A_{\rm CP } }$) for charmless $B$
decays at Belle II, which operates on or near the $\Upsilon$(4S) resonance at
the SuperKEKB asymmetric energy $e^{+}e^{-}$ collider. We use samples of 2019
and 2020 data corresponding to 62.8 fb$^{-1}$ of integrated luminosity. The
samples are analysed using two-dimensional fits in $\Delta E$ and $M_{\it bc}$
to determine signal yields of approximately 568, 103, and 115 decays for the
channels $B^0 \to K^+\pi^-$, $B^+ \to K_{\rm S}^0\pi^+$, and $B^0 \to
\pi^+\pi^-$, respectively. 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. The
results are compatible with known determinations and contribute important
information to an early assessment of Belle II detector performance.
PermalinkURL http://arxiv.org/abs/2106.03766v1
researchmap用URL http://arxiv.org/pdf/2106.03766v1