Measurement of the branching fractions of the decays Λ_c⁺→ΛK_S⁰K⁺, Λ_c⁺→ΛK_S⁰π⁺ and Λ_c⁺→ΛK^*+

2024/10/22 by BESIII Collaboration, M. Ablikim, Ablikim, M. +740
Physics and Astronomy · #Black Holes and Theoretical Physics #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2410.16912

openalex publication_date 2024/10/22 · openalex created_date 2024/11/13 · openalex updated_date 2026/07/30

Abstract

Studies are performed of the Cabibbo-favored decay Λ_c⁺→ΛK_S⁰K⁺ and the singly Cabibbo-suppressed decay Λ_c⁺→ΛK_S⁰π⁺, based on a sample of e⁺e^- collision data, corresponding to an integrated luminosity of 4.5 fb^-1, accumulated at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with the BESIII detector. The decay Λ_c⁺→ΛK_S⁰π⁺ is observed for the first time. The branching fractions of Λ_c⁺→ΛK_S⁰K⁺ and Λ_c⁺→ΛK_S⁰π⁺ are measured to be (3.04±0.30±0.16)× 10^-3 and (1.73±0.27±0.10)× 10^-3, respectively, where the first uncertainties are statistical and the second are systematic. These results correspond to the most precise measurement of these quantities for both decays. Evidence of a K^*+ contribution in the Λ_c⁺→ΛK_S⁰π⁺ decay is found with a statistical significance of 4.7σ. The branching fraction of Λ_c⁺→ΛK^*+ is calculated under three possible interference scenarios.

Related

• 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⁺
• Improved measurement of absolute branching fraction of the inclusive decay Λ_c⁺ → K_S⁰ X
• Measurements of Λ⁺_c Branching Fractions of Cabibbo-Suppressed Decay Modes
• Observation of Λ_c⁺ → Λ⁰ K⁺, Λ_c⁺ → Σ⁰ K⁺ and Λ_c⁺ → Σ⁺ K⁺π^- decays
• Measurements of K_S⁰-K_L⁰ asymmetries in the decays Λ_c⁺ → pK_L,S⁰, pK_L,S⁰π⁺π^- and pK_L,S⁰π⁰