Measurements of K_S⁰-K_L⁰ asymmetries in the decays Λ_c⁺ → pK_L,S⁰, pK_L,S⁰π⁺π^- and pK_L,S⁰π⁰

2024/06/26 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +649
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2406.18083

Abstract

Using e⁺e^- annihilation data sets corresponding to an integrated luminosity of 4.5 fb^-1, collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, we report the first measurements of the absolute branching fractions B(Λ_c⁺→ pK_L⁰)=(1.67 ± 0.06 ± 0. 04)%, B(Λ_c⁺→ pK_L⁰π⁺π^-)=(1.69 ± 0.10 ± 0.05)%, and B(Λ_c⁺→ pK_L⁰π⁰)=(2.02 ± 0.13 ± 0.05)%, where the first uncertainties are statistical and the second systematic. Combining with the known branching fractions of Λ_c⁺ → pK_S⁰, Λ_c⁺ → pK_S⁰π⁺π^-, and Λ_c⁺ → pK_S⁰π⁰, we present the first measurements of the K_S⁰-K_L⁰ asymmetries R(Λ_c⁺, K_S,L⁰X) = \fracB(Λ_c⁺ → K_S⁰ X) - B(Λ_c⁺ → K_L⁰ X)B(Λ_c⁺ → K_S⁰ X) + B(Λ_c⁺ → K_L⁰ X) in charmed baryon decays: R(Λ_c⁺, pK_S,L⁰) = -0.025 ± 0.031, R(Λ_c⁺, pK_S,L⁰π⁺π^-) = -0.027 ± 0.048, and R(Λ_c⁺, pK_S,L⁰π⁰) =-0.015 ± 0.046. No significant asymmetries within the uncertainties are observed.

Related

• Measurement of the branching fractions of the decays Λ_c⁺→ΛK_S⁰K⁺, Λ_c⁺→ΛK_S⁰π⁺ and Λ_c⁺→ΛK^*+
• Measurement of branching fractions and CP asymmetries in \mathitΛ_b⁰(\mathitΞ_b⁰) → pK_{\mathrm S}⁰h^- decays
• 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⁺
• Searches for Λ_b⁰ and Ξ_b⁰ decays to K_{\mathrm S}⁰pπ^- and K_{\mathrm S}⁰pK^- final states with the first observation of the Λ_b⁰ → K_S⁰pπ^- decay
• Improved measurement of absolute branching fraction of the inclusive decay Λ_c⁺ → K_S⁰ X