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+.

Observations of the Cabibbo-Suppressed decays Lc->npipi0, npipipi and the Cabibbo-Favored decay Lc-> nKpipi

Garzia I.;
2023

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+.
2023
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.; Balos...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2530602
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