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, Λ+c → nπ+π0, nπ+π-π+ and the Cabibbo-Favored decay Λ+c → nK-π+π+

Amoroso A.;Bianchi F.;Bortone A.;Destefanis M.;De Mori F.;Greco M.;Lavezzi L.;Maggiora M.;Marcello S.;Rolo M.;Sosio S.;Spataro S.;
2023-01-01

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
47
2
023001-1
023001-18
BESIII detector; Branching fraction; Λ; +; c; baryon
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 ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1946264
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