Measurements of branching fractions of Λc+→Σ+η and
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,S. Banerjee,P. K. Behera,K. Belous,J. V. 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. Ferber,A. Frey,B. G. Fulsom,V. Gaur,A. Giri,P. Goldenzweig,E. Graziani,T. Gu,K. Gudkova,C. Hadjivasiliou,K. Hayasaka,H. Hayashii,C.-L. Hsu,K. Inami,N. Ipsita,A. Ishikawa,R. Itoh,W. W. Jacobs,Y. Jin,K. K. Joo,D. Kalita,A. B. Kaliyar,C. Kiesling,C. H. Kim,D. Y. Kim,K. -H. Kim,Y. -K. Kim,P. Kodyš,T. Konno,A. Korobov,S. Korpar,E. Kovalenko,P. Krokovny,T. Kuhr,M. Kumar,Rajeev Kumar,K. Kumara,A. Kuzmin,Y. J. Kwon,T. Lam,J. S. Lange,S. C. Lee,L. K. Li,Y. Li,Y. B. Li,L. Li Gioi,J. Libby,K. Lieret,M. Masuda,T. Matsuda,S. K. Maurya,F. Meier,M. Merola,F. Metzner,R. Mizuk,R. Mussa,I. Nakamura,M. Nakao,Z. Natkaniec,A. Natochii,L. Nayak,M. Niiyama,N. K. Nisar,S. Nishida,S. Ogawa,Hiroyuki Ono,Y. Onuki,P. Oskin,G. Pakhlova,S. Pardi,H. Park,S. Patra,S. Paul,T. K. Pedlar,R. Pestotnik,L. E. Piilonen,E. Prencipe,M. T. Prim,N. Rout,G. Russo,Deepak Kumar Sahoo,S. Sandilya,A. Sangal,L. Šantelj,V. Savinov,G. Schnell,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,W. Shan,M. Shapkin,C. Sharma,J. G. Shiu,A. Sokolov,E. Solovieva,M. Starič,M. Sumihama,K. Sumisawa,T. Sumiyoshi,W. Sutcliffe,M. Takizawa,U. Tamponi,K. Tanida,F. Tenchini,M. Uchida,T. Uglov,Y. Unno,S. Uno,S. E. Vahsen,R. Van Tonder,G. Varner,A. Vinokurova,E. Waheed,E. Wang,M. Watanabe,S. Watanuki,E. Won,B. D. Yabsley,W. B. Yan,S. B. Yang,J. Yelton,J. H. Yin,C. Z. Yuan,Z. P. Zhang,V. Zhilich
Physical review（2023）
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摘要
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.
