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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2020/08 |
| 形態種別 | その他 |
| 標題 | Measurement of Branching Fractions of $Λ_{c}^{+} \rightarrow ηΛπ^{+}$, $ηΣ^{0} π^{+}$, $Λ(1670) π^{+}$, and $ηΣ(1385)^{+}$ |
| 執筆形態 | その他 |
| 著者・共著者 | J. Y. Lee,K. Tanida,Y. Kato,S. K. Kim,S. B. Yang,I. Adachi,J. K. Ahn,H. Aihara,S. Al Said,D. M. Asner,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,P. Behera,C. Beleño,J. Bennett,M. Bessner,B. Bhuyan,T. Bilka,J. Biswal,G. Bonvicini,A. Bozek,M. Bračko,T. E. Browder,M. Campajola,L. Cao,D. Cervenkov,M. -C. Chang,P. Chang,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,K. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,G. De Nardo,F. Di Capua,Z. Doležal,T. V. Dong,S. Eidelman,D. Epifanov,T. Ferbe |
| 概要 | We report branching fraction measurements of four decay modes of the
$\Lambda_{c}^{+}$ baryon, each of which includes an $\eta$ meson and a $\Lambda$ baryon in the final state, and all of which are measured relative to the $\Lambda_{c}^{+} \rightarrow p K^{-} pi^{+}$ decay mode. The results are based on a $980~\mathrm{fb^{-1 } }$ data sample collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Two decays, $\eta \Sigma^{0} \pi^{+}$ and $\Lambda(1670) \pi^{+}$, are observed for the first time, while the measurements of the other decay modes, $\Lambda_{c}^{+} \rightarrow \eta\Lambda\pi^{+}$ and $\eta\Sigma(1385)^{+}$, are more precise than those made previously. We obtain $\mathcal{B}(\Lambda_{c}^{+} \rightarrow \eta \Lambda \pi^{+})/\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})$ = $0.293 \pm 0.003 \pm 0.014$, $\mathcal{B}(\Lambda_{c}^{+} \rightarrow \eta \Sigma^{0} \pi^{+})/\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})$ = $0.120 \pm 0.006 \pm 0.006$, $\mathcal{B}(\Lambda_{c}^{+} \rightarrow \Lambda(1670) \pi^{+}) \times \mathcal{B}(\Lambda(1670) \rightarrow \eta \Lambda)/\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})$ = $(5.54 \pm 0.29 \pm 0.73 ) \times 10^{-2}$, and $\mathcal{B}(\Lambda_{c}^{+} \rightarrow \eta \Sigma(1385)^{+})/\mathcal{B}(\Lambda_{c}^{+} \rightarrow p K^{-} \pi^{+})$ = $0.192 \pm 0.006 \pm 0.016$. The mass and width of the $\Lambda(1670)$ are also precisely determined to be $1674.3 \pm 0.8 \pm 4.9~{\rm MeV}/c^{2}$ and $36.1 \pm 2.4 \pm 4.8~{\rm MeV}$, respectively, where the uncertainties are statistical and systematic, respectively. |
| DOI | 10.1103/PhysRevD.103.052005 |
| PermalinkURL | http://arxiv.org/abs/2008.11575v1 |
| researchmap用URL | http://arxiv.org/pdf/2008.11575v1 |