Λ_c⁺ decays at BESIII

2022/07/27 by Gao, Yang
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2207.13388

Abstract

BESIII has made great progress in taking data which is the largest data samples near the Λ_c⁺Λ_c^- threshold. We have measured the branching fraction of Λ_c⁺→ nπ⁺ to be (6.6± 1.2_stat.± 0.4_syst.)× 10^-4 with the statistical significance of 7.3 σ firstly using 3.9fb^-1 e⁺e^- collision collected with BESIII detector at six center-of-mass energies between 4.612 and 4.699 GeV. With the result of the branching fraction of Λ_c⁺→ pπ⁰ from Belle, the ratio of the branching fractions between Λ_c⁺→ nπ⁺ and Λ_c⁺→ pπ⁰ is measured to be larger than 7.2 at 90% confidence level. The branching fractions of Λ_c⁺→ Λπ⁺ and Λ_c⁺→ Σ⁰ π⁺ are measured to be (1.31± 0.08_stat.± 0.05_syst.)× 10^-2 and (1.22± 0.08_stat.± 0.07_syst.)× 10^-2, respectively, which are consistent with previous BESIII results. More results of Λ_c⁺ decays will be published with better precision this year using 6.4fb^-1 e⁺e^- collision data samples between 4.600 and 4.946 GeV.

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