Measurement of the branching fractions of the Cabibbo-favored decays Λ_c⁺→ΛK_S⁰K⁺ and Λ_c⁺→Ξ⁰K_S⁰π⁺ and search for Λ_c⁺→Σ⁰ K_S⁰K⁺

2025/06/03 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +664
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2506.02969

Abstract

Based on e⁺e^- collision data corresponding to an integrated luminosity of about 4.5 fb^-1 collected at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with the BESIII detector, the absolute branching fraction of the Cabibbo-favored decay Λ_c⁺→ΛK_S⁰K⁺ is measured to be (3.12±0.46±0.15)×10^-3. Combined with a previous measurement from the BESIII Collaboration, the branching fraction of the decay Λ_c⁺→ΛK_S⁰K⁺ is calculated to be (3.07±0.26±0.13)×10^-3. The decay Λ_c⁺→Ξ⁰K_S⁰π⁺ is observed for the first time with a statistical significance of 6.6σ, and its branching fraction is determined to be (3.70±0.60±0.21)×10^-3. In addition, a search for the decay Λ_c⁺→Σ⁰ K_S⁰K⁺ is performed and its branching fraction is determined to be (0.80^+0.28_-0.24±0.16)×10^-3, corresponding to an upper limit of 1.28×10^-3 at 90% confidence level. These measurements provide new information that can be used to distinguish between theoretical models.

Related

• Measurement of the branching fractions of the decays Λ_c⁺→ΛK_S⁰K⁺, Λ_c⁺→ΛK_S⁰π⁺ and Λ_c⁺→ΛK^*+
• Measurements of Λ⁺_c Branching Fractions of Cabibbo-Suppressed Decay Modes
• Search for the Cabibbo-suppressed decays Λ_c⁺→Σ⁰K⁺π⁰ and Λ_c⁺→Σ⁰K⁺π⁺π^-
• Improved measurement of absolute branching fraction of the inclusive decay Λ_c⁺ → K_S⁰ X
• Λ_c⁺ decays at BESIII