Measurement of the mass and width of the Λc(2625)+ charmed baryon and the branching ratios of
Belle Collaboration,D. Wang,J. Yelton,I. Adachi,J. K. Ahn,H. Aihara,D. M. Asner,H. Atmacan,R. Ayad,V. Babu,S. Banerjee,M. Bauer,P. K. Behera,K. Belous,J. V. Bennett,M. Bessner,T. Bilka,D. Biswas,D. Bodrov,J. Borah,A. Bożek,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,M.-C. Chang,A. Chen,B. G. Cheon,H. E. Cho,K. Cho,S. -J. Cho,S. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Das,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua,Z. Doležal,T. V. Dong,D. Dossett,D. Epifanov,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. B. Garg,V. Gaur,A. Giri,P. Goldenzweig,E. Graziani,T. Gu,K. Gudkova,C. Hadjivasiliou,Xiaoyan Han,K. Hayasaka,H. Hayashii,M. T. Hedges,C.-L. Hsu,K. Inami,N. Ipsita,A. Ishikawa,R. Itoh,M. Iwasaki,W. W. Jacobs,E.-J. Jang,S. Jia,Y. Jin,A. B. Kaliyar,K. H. Kang,T. Kawasaki,C. Kiesling,C. H. Kim,D. Y. Kim,K. -H. Kim,Y. -K. Kim,K. Kinoshita,P. Kodyš,A. Korobov,S. Korpar,E. Kovalenko,P. Križan,P. Krokovny,M. Kumar,Rajeev Kumar,K. Kumara,Y. J. Kwon,T. Lam,J. S. Lange,S. C. Lee,P. Lewis,L. K. Li,Y. Li,Y. B. Li,L. Li Gioi,J. Libby,K. Lieret,Y.-R. Lin,D. Liventsev,T. Matsuda,D. Matvienko,F. Meier,M. Merola,F. Metzner,K. Miyabayashi,R. Mizuk,G. B. Mohanty,R. Mussa,I. Nakamura,Takashi Nakano,M. Nakao,Z. Natkaniec,A. Natochii,L. Nayak,M. Nayak,N. K. Nisar,S. Nishida,S. Ogawa,H. Ono,P. Oskin,G. Pakhlova,S. Pardi,H. Park,J. Park,S. Patra,S. Paul,T. K. Pedlar,R. Pestotnik,L. E. Piilonen,T. Podobnik,E. Prencipe,M. T. Prim,N. Rout,G. Russo,S. Sandilya,A. Sangal,L. Šantelj,V. Savinov,G. Schnell,J. Schueler,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,W. Shan,M. Shapkin,C. Sharma,C. P. Shen,J. G. Shiu,A. Sokolov,E. Solovieva,M. Starič,M. Sumihama,T. Sumiyoshi,W. Sutcliffe,M. Takizawa,U. Tamponi,K. Tanida,F. Tenchini,M. Uchida,S. Uno,R. Van Tonder,G. Varner,K. E. Varvell,A. Vinokurova,M. -Z. Wang,X. L. Wang,M. Watanabe,S. Watanuki,O. Werbycka,E. Won,Xiaolong Xu,B. D. Yabsley,W. Yan,S. B. Yang,J. H. Yin,C. Z. Yuan,L. Yuan,Z. P. Zhang,V. Zhilich,V. Zhukova
Physical review（2023）
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摘要
Using the entire data sample of $980\,\textrm{fb}^{-1}$ collected with the Belle detector operating at the KEKB asymmetric-energy collider, we report the measurement of the mass, width, and the relative branching ratios of the $\Lambda_c(2625)^+$ charmed baryon. The mass difference between $\Lambda_c(2625)^+$ and $\Lambda_c^+$ is measured to be $M(\Lambda_c(2625)^{+}) - M(\Lambda_c^{+}) = 341.518 \pm 0.006 \pm 0.049\ \mathrm{MeV}/\mathit{c}^2$. The upper limit on the width is measured to be $\Gamma(\Lambda_c(2625)^+) < 0.52\,\mathrm{MeV}/\textit{c}^2$ at 90\% credibility level. Based on a full Dalitz plot fit, branching ratios with respect to the mode $\Lambda_c(2625)^+ \to \Lambda_c^+ \pi^+ \pi^-$ are measured to be $\frac{\mathcal{B}(\Lambda_c(2625)^+ \to \Sigma_c^{0} \pi^{+})} {\mathcal{B}(\Lambda_c(2625)^+ \to \Lambda_c^+ \pi^{+} \pi^{-})} = (5.19 \pm 0.23 \pm 0.40) \%$ and $\frac{\mathcal{B}(\Lambda_c(2625)^+ \to \Sigma_c^{++} \pi^{-})} {\mathcal{B}(\Lambda_c(2625)^+ \to \Lambda_c^+ \pi^{+} \pi^{-})} = (5.13 \pm 0.26 \pm 0.32) \%$. These measurements can be used to further constrain the parameters of the underlying theoretical models.
