Measurement of branching fractions of Λc+ →η Λπ+, η ς0π+, Λ (1670)π+, and η ς (1385)+

Date Issued
15-03-2021
Author(s)
Lee, J. Y.
Tanida, K.
Kato, Y.
Kim, S. K.
Yang, S. B.
Adachi, I.
Ahn, J. K.
Aihara, H.
Al Said, S.
Asner, D. M.
Aushev, T.
Ayad, R.
Babu, V.
Bahinipati, S.
Behera, P.
Beleño, C.
Bennett, J.
Bessner, M.
Bhuyan, B.
Bilka, T.
Biswal, J.
Bonvicini, G.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
Campajola, M.
Cao, L.
ÄŒervenkov, D.
Chang, M. C.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Cho, K.
Choi, S. K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
De Nardo, G.
Di Capua, F.
DoleŽal, Z.
Dong, T. V.
Eidelman, S.
Epifanov, D.
Ferber, T.
Fulsom, B. G.
Garg, R.
Gaur, V.
Garmash, A.
Giri, A.
Goldenzweig, P.
Golob, B.
Hadjivasiliou, C.
Hartbrich, O.
Hayasaka, K.
Hayashii, H.
Hedges, M. T.
Hernandez Villanueva, M.
Hsu, C. L.
Inami, K.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Jacobs, W. W.
Jang, E. J.
Jia, S.
Jin, Y.
Joo, C. W.
Joo, K. K.
Kang, K. H.
Karyan, G.
Kichimi, H.
Kiesling, C.
Kim, B. H.
Kim, D. Y.
Kim, K. H.
Kim, K. T.
Kim, S. H.
Kim, Y. J.
Kim, Y. K.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Kotchetkov, D.
KriŽan, P.
Kroeger, R.
Krokovny, P.
Kuhr, T.
Kulasiri, R.
Kumara, K.
Kuzmin, A.
Kwon, Y. J.
Lee, S. C.
Li, C. H.
Li, L. K.
Li, Y. B.
Li Gioi, L.
Indian Institute of Technology, Madras
DOI
Abstract
We report branching fraction measurements of four decay modes of the Λc+ baryon, each of which includes an η meson and a Λ baryon in the final state, and all of which are measured relative to the Λc+→pK-π+ decay mode. The results are based on a 980 fb-1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e- collider. Two decays, Λc+→ης0π+ and Λ(1670)π+, are observed for the first time, while the measurements of the other decay modes, Λc+→ηΛπ+ and ης(1385)+, are more precise than those made previously. We obtain relative branching fractions of B(Λc+→ηΛπ+)/B(Λc+→pK-π+)=0.293±0.003±0.014, B(Λc+→ης0π+)/B(Λc+→pK-π+)=0.120±0.006±0.010, B(Λc+→Λ(1670)π+)×B(Λ(1670)→ηΛ)/B(Λc+→pK-π+)=(5.54±0.29±0.73)×10-2, and B(Λc+→ης(1385)+)/B(Λc+→pK-π+)=0.192±0.006±0.016. The mass and width of the Λ(1670) are also precisely determined to be 1674.3±0.8±4.9 MeV/c2 and 36.1±2.4±4.8 MeV, respectively, where the uncertainties are statistical and systematic, respectively.
Volume
103