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First measurement of the Λc+ → pη′ decay
Date Issued
01-03-2022
Author(s)
Li, S. X.
Cui, J. X.
Shen, C. P.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D. M.
Atmacan, H.
Aushev, T.
Ayad, R.
Babu, V.
Behera, P.
Belous, K.
Bessner, M.
Bhardwaj, V.
Bhuyan, B.
Bilka, T.
Bodrov, D.
Bonvicini, G.
Borah, J.
Bozek, A.
BraÄ ko, M.
Branchini, P.
Browder, T. E.
Budano, A.
Campajola, M.
ÄŒervenkov, D.
Chang, M. C.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Cho, H. E.
Cho, K.
Cho, S. J.
Choi, S. K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
Das, S.
Dash, N.
De Nardo, G.
De Pietro, G.
Dhamija, R.
Di Capua, F.
Doležal, Z.
Dong, T. V.
Epifanov, D.
Ferber, T.
Ferlewicz, D.
Fulsom, B. G.
Garg, R.
Gaur, V.
Gabyshev, N.
Giri, A.
Goldenzweig, P.
Golob, B.
Graziani, E.
Gu, T.
Hara, T.
Hayasaka, K.
Hayashii, H.
Hou, W. S.
Inami, K.
Ishikawa, A.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jang, E. J.
Jia, S.
Jin, Y.
Joo, K. K.
Kahn, J.
Kaliyar, A. B.
Kang, K. H.
Kato, Y.
Kawasaki, T.
Kichimi, H.
Kiesling, C.
Kim, C. H.
Kim, D. Y.
Kim, Y. K.
Kinoshita, K.
Kodyš, P.
Konno, T.
Korobov, A.
Korpar, S.
Kovalenko, E.
Križan, P.
Kroeger, R.
Krokovny, P.
Kumar, M.
Kumar, R.
Kumara, K.
Kwon, Y. J.
Lam, T.
Laurenza, M.
Lee, S. C.
Abstract
We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay Λc+→ pη′ with η′ → ηπ+π−, using a data sample corresponding to an integrated luminosity of 981 fb−1, collected by the Belle detector at the KEKB e+e− asymmetric-energy collider. A significant Λc+→ pη′ signal is observed for the first time with a signal significance of 5.4σ. The relative branching fraction with respect to the normalization mode Λc+→ pK−π+ is measured to beB(Λc+→pη′)B(Λc+→pK−π+)=(7.54±1.32±0.73)×10−3, where the uncertainties are statistical and systematic, respectively. Using the world-average value of B(Λc+→pK−π+) = (6.28 ± 0.32) × 10−2, we obtainB(Λc+→pη′)=(4.73±0.82±0.46±0.24)×10−4, where the uncertainties are statistical, systematic, and from B(Λc+→pK−π+), respectively. [Figure not available: see fulltext.]
Volume
2022