Observations of the Cabibbo-Suppressed decays , and the Cabibbo-Favored decay *

Journal article

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+

Authors: Ablikim, M; Achasov, MN; Adlarson, P; Albrecht, M; Aliberti, R

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Chinese Physics C
• Volume: 47
• Issue: 2
• Pages: 023001-023001
• Publication date: 2022-10-25
• DOI: 10.1088/1674-1137/ac9d29
• ISSN: 1674-1137
• Language: English
• Keywords: Cabibbo–Kobayashi–Maskawa matrix