教員情報 - 新山　雅之

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	2021/04
形態種別	その他
標題	Measurements of branching fractions and asymmetry parameters of $Ξ^0_c\to Λ\bar K^{0}$, $Ξ^0_c\to Σ^0\bar K^{0}$, and $Ξ^0_c\to Σ^+K^{*-}$ decays at Belle
執筆形態	その他
著者・共著者	Belle Collaboration,S. Jia,S. S. Tang,C. P. Shen,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. Bracko,T. E. Browder,M. Campajola,D. Cervenkov,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,G. De Nardo,R. Dhamija,F. Di Capua,Z. Dolezal,T. V. Dong,S. Eidelman,D. E
概要	Using a data sample of 980 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we study the processes of $\Xi^0_c\to \Lambda\bar K^{0}$, $\Xi^0_c\to \Sigma^0\bar K^{0}$, and $\Xi^0_c\to \Sigma^+K^{-}$ for the first time. The relative branching ratios to the normalization mode of $\Xi^0_c\to\Xi^-\pi^+$ are measured to be $${\cal B}(\Xi^0_c\to \Lambda\bar K^{0})/{\cal B}(\xic\to \Xi^-\pi^+)=0.18\pm0.02({\rm stat.})\pm0.01({\rm syst.}),$$ $${\cal B}(\Xi^0_c\to \Sigma^0\bar K^{0})/{\cal B}(\xic\to \Xi^-\pi^+)=0.69\pm0.03({\rm stat.})\pm0.03({\rm syst.}),$$ $${\cal B}(\Xi^0_c\to \Sigma^+K^{-})/{\cal B}(\xic\to \Xi^-\pi^+)=0.34\pm0.06({\rm stat.})\pm0.02({\rm syst.}),$$ where the uncertainties are statistical and systematic, respectively. We obtain %measure the branching fractions of $\Xi^0_c\to \Lambda\bar K^{0}$, $\Xi^0_c\to \Sigma^0\bar K^{0}$, and $\Xi^0_c\to \Sigma^+K^{-}$ to be $${\cal B}(\Xi^0_c\to \Lambda\bar K^{0})=(3.3\pm0.3({\rm stat.})\pm0.2({\rm syst.})\pm1.0({\rm ref.}))\times10^{-3},$$ $${\cal B}(\Xi^0_c\to \Sigma^0\bar K^{0})=(12.4\pm0.5({\rm stat.})\pm0.5({\rm syst.})\pm3.6({\rm ref.}))\times10^{-3},$$ $${\cal B}(\Xi^0_c\to \Sigma^+K^{-})=(6.1\pm1.0({\rm stat.})\pm0.4({\rm syst.})\pm1.8({\rm ref.}))\times10^{-3},$$ where the uncertainties are statistical, systematic, and from ${\cal B}(\xic \to \Xi^-\pi^+)$, respectively. The asymmetry parameters $\alpha(\Xi^0_c\to \Lambda\bar K^{0})$ and $\alpha(\Xi^0_c\to \Sigma^+K^{-})$ are $0.15\pm0.22({\rm stat.})\pm0.04({\rm syst.})$ and $-0.52\pm0.30({\rm stat.})\pm0.02({\rm syst.})$, respectively, where the uncertainties are statistical followed by systematic.
DOI	10.1007/JHEP06(2021)160
PermalinkURL	http://arxiv.org/abs/2104.10361v3
researchmap用URL	http://arxiv.org/pdf/2104.10361v3