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 2022/08
形態種別 その他
標題 Measurements of branching fractions of $Λ_c^+ \to Σ^+ η$ and $Λ_c^+ \to Σ^+ η'$ and asymmetry parameters of $Λ_c^+ \to Σ^+ π^0$, $Λ_c^+ \to Σ^+ η$, and $Λ_c^+ \to Σ^+ η'$
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,H. Atmacan,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,Sw. Banerjee,P. Behera,K. Belous,J. Bennett,M. Bessner,T. Bilka,D. Biswas,A. Bobrov,D. Bodrov,J. Borah,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,M. -C. Chang,P. 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,G. De Pietro,R. Dhamija,F. Di Capua,T. V. Dong,T. Fe
概要 We report a study of $\Lambda_c^+ \to \Sigma^+ \pi^0$, $\Lambda_c^+ \to
\Sigma^+ \eta$, and $\Lambda_c^+ \to \Sigma^+ \eta'$ using the data sample
corresponding to an integrated luminosity of 980 $\rm fb^{-1}$ collected with
the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The
branching fractions relative to $\Lambda_c^+ \to \Sigma^+ \pi^0$ are measured
as: $\mathcal{B}_{\Lambda_c^+ \to \Sigma^+ \eta}/\mathcal{B}_{\Lambda_c^+ \to
\Sigma^+ \pi^0}=0.25 \pm 0.03 \pm 0.01$ and $\mathcal{B}_{\Lambda_c^+ \to
\Sigma^+ \eta'}/\mathcal{B}_{\Lambda_c^+ \to \Sigma^+ \pi^0}=0.33 \pm 0.06 \pm
0.02$. Using $\mathcal{B}_{\Lambda_c^+ \to \Sigma^+ \pi^0}=(1.25 \pm 0.10)\%$,
we obtain $\mathcal{B}_{\Lambda_c^+ \to \Sigma^+ \eta}=(3.14 \pm 0.35 \pm 0.11
\pm 0.25)\times10^{-3}$ and $\mathcal{B}_{\Lambda_c^+ \to \Sigma^+ \eta'}=(4.16
\pm 0.75 \pm 0.21 \pm 0.33)\times10^{-3}$. Here the uncertainties are
statistical, systematic, and from $\mathcal{B}_{\Lambda_c^+ \to \Sigma^+
\pi^0}$, respectively. The ratio of the branching fraction of $\Lambda_c^+ \to
\Sigma^+ \eta'$ with respect to that of $\Lambda_c^+ \to \Sigma^+ \eta$ is
measured to be $\mathcal{B}_{\Lambda_c^+ \to \Sigma^+
\eta'}/\mathcal{B}_{\Lambda_c^+ \to \Sigma^+ \eta}=1.34 \pm 0.28 \pm 0.06$. We
update the asymmetry parameter of $\Lambda_c^+ \to \Sigma^+ \pi^0$,
$\alpha_{\Sigma^+ \pi^0} = -0.48 \pm 0.02 \pm 0.02$, with a considerably
improved precision. The asymmetry parameters of $\Lambda_c^+ \to \Sigma^+ \eta$
and $\Lambda_c^+ \to \Sigma^+ \eta'$ are measured to be $\alpha_{\Sigma^+ \eta}
= -0.99 \pm 0.03 \pm 0.05$ and $\alpha_{\Sigma^+ \eta'} = -0.46 \pm 0.06 \pm
0.03$ for the first time.
DOI 10.1103/PhysRevD.107.032003
PermalinkURL http://arxiv.org/abs/2208.10825v2
researchmap用URL http://arxiv.org/pdf/2208.10825v2