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Observations of the Cabibbo-Suppressed decays, Λ<sup>+</sup><inf>c</inf> → nπ<sup>+</sup>π0, nπ<sup>+</sup>π<sup>-</sup>π<sup>+</sup> and the Cabibbo-Favored decay Λ<sup>+</sup><inf>c</inf> → nK<sup>-</sup>π<sup>+</sup>π<sup>+</sup>
Date Issued
01-02-2023
Author(s)
Ablikim, M.
Achasov, M. N.
Adlarson, P.
Albrecht, M.
Aliberti, R.
Amoroso, A.
An, M. R.
An, Q.
Bai, Y.
Bakina, O.
Baldini Ferroli, R.
Balossino, I.
Ban, Y.
Batozskaya, V.
Becker, D.
Begzsuren, K.
Berger, N.
Bertani, M.
Bettoni, D.
Bianchi, F.
Bianco, E.
Bloms, J.
Bortone, A.
Boyko, I.
Briere, R. A.
Brueggemann, A.
Cai, H.
Cai, X.
Calcaterra, A.
Cao, G. F.
Cao, N.
Cetin, S. A.
Chang, J. F.
Chang, W. L.
Che, G. R.
Chelkov, G.
Chen, C.
Chen, Chao
Chen, G.
Chen, H. S.
Chen, M. L.
Chen, S. J.
Chen, S. M.
Chen, T.
Chen, X. R.
Chen, X. T.
Chen, Y. B.
Chen, Z. J.
Cheng, W. S.
Choi, S. K.
Chu, X.
Cibinetto, G.
Cossio, F.
Cui, J. J.
Dai, H. L.
Dai, J. P.
Dbeyssi, A.
De Boer, R. E.
Dedovich, D.
Deng, Z. Y.
Denig, A.
Denysenko, I.
Destefanis, M.
De Mori, F.
Ding, Y.
Ding, Y.
Dong, J.
Dong, L. Y.
Dong, M. Y.
Dong, X.
Du, S. X.
Duan, Z. H.
Egorov, P.
Fan, Y. L.
Fang, J.
Fang, S. S.
Fang, W. X.
Fang, Y.
Farinelli, R.
Fava, L.
Feldbauer, F.
Felici, G.
Feng, C. Q.
Feng, J. H.
Fischer, K.
Fritsch, M.
Fritzsch, C.
Fu, C. D.
Gao, H.
Gao, Y. N.
Gao, Yang
Garbolino, S.
Garzia, I.
Ge, P. T.
Ge, Z. W.
Geng, C.
Gersabeck, E. M.
Gilman, A.
Goetzen, K.
Gong, L.
Abstract
Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb-1, collected by the BESIII detector in the energy region between 4599.53 MeV and 4698.82 MeV, we report the first observations of the Cabibbo-suppressed decays Λ+c → nπ+ π0, Λ+c → nπ+ π-π+, and the Cabibbo-favored decay Λ+c → nK- π+π+ with statistical significances of 7.9σ, 7.8σ, and > 10σ, respectively. The branching fractions of these decays are measured to be B(Λ+c → nπ+ π0) = (0.64 ± 0.09 ± 0.02)%, B(Λ+c → nπ+ π-π+) = (0.45 ± 0.07 ± 0.03)%, and B(Λ+c → nK- π+π+) = (1.90 ± 0.08 ± 0.09)%, where the first uncertainties are statistical and the second are systematic. We find that the branching fraction of the decay Λ+c → nπ+ π0 is about one order of magnitude higher than that of Λ+c → nπ+.
Volume
47