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 2021/11
形態種別 その他
標題 Measurement of the branching fraction and $CP$ asymmetry for $B\to\bar{D}^{0} π$ decays
執筆形態 その他
著者・共著者 Belle Collaboration,T. Bloomfield,M. E. Sevior,I. Adachi,H. Aihara,S. Al Said,D. M. Asner,V. Aulchenko,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,P. Behera,J. Bennett,M. Bessner,T. Bilka,J. Biswal,A. Bobrov,G. Bonvicini,A. Bozek,M. Bračko,T. E. Browder,M. Campajola,L. Cao,D. Červenkov,M. -C. Chang,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,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.
概要 We measure the branching fractions and $CP$ asymmetries for the decays
$B^{0}\to \bar{D}^{0}\pi^{0}$ and $B^{+}\to \bar{D}^{0}\pi^{+}$, using a data
sample of $772\times 10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$
resonance with the Belle detector at the KEKB $e^{+}e^{-}$ collider. The
branching fractions obtained and direct $CP$ asymmetries are
$\mathcal{B}(B^{0}\to \bar{D}^{0}\pi^{0}) = [2.70 \pm 0.06~ \text{(stat.)} \pm
0.10~ \text{(syst.)}] \times 10^{-4}$, $\mathcal{B}(B^{+}\to
\bar{D}^{0}\pi^{+}) = [4.53 \pm 0.02~ \text{(stat.)} \pm 0.15~ \text{(syst.)}]
\times 10^{-3}$, $ {\cal A}_{CP}(B^{0}\to \bar{D}^{0}\pi^{0}) = [+0.42 \pm
2.05~ \text{(stat.)} \pm 1.22~ \text{(syst.)}]\%$, and $ {\cal A}_{CP}(B^{+}\to
\bar{D}^{0}\pi^{+}) = [+0.19 \pm 0.36~ \text{(stat.)} \pm 0.57~
\text{(syst.)}]\%$. The measurements of $\mathcal{B}$ are the most precise to
date and are in good agreement with previous results, as is the measurement of
${\cal A}_{CP}(B^{+}\to \bar{D}^{0}\pi^{+})$. The measurement of ${\cal
A}_{CP}$ for $B^{0}\to \bar{D}^{0}\pi^{0}$ is the first for this mode, and the
value is consistent with Standard Model expectations.
DOI 10.1103/PhysRevD.105.072007
PermalinkURL http://arxiv.org/abs/2111.12337v2
researchmap用URL http://arxiv.org/pdf/2111.12337v2