Observation of Λ_c⁺ → Λ⁰ K⁺, Λ_c⁺ → Σ⁰ K⁺ and Λ_c⁺ → Σ⁺ K⁺π^- decays

2001/08/01 by K. Abe, Abe, K.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0108003

Paper submitted to the 2001 Lepton Photon Conference

arxiv created 2001/08/01 · arxiv updated 2009/11/30

Abstract

We present measurements of the Cabibbo-suppressed decays Λ_c⁺ → Λ⁰ K⁺ and Λ_c⁺ → Σ⁰ K⁺ (both first observations), Λ_c⁺ → Σ⁺ K⁺π^- (seen with large statistics for the first time), Λ_c⁺ → p K⁺ K^- and Λ_c⁺ → p ϕ (measured with improved accuracy). Improved branching ratio measurements for the decays Λ_c⁺ → Σ⁰ K⁺ K^- and Λ_c⁺ → Σ⁰ ϕ, which are attributed to W-exchange diagrams, are shown. We also present the first evidence for Λ_c⁺ → Ξ(1690) K⁺ and set an upper limit on non-resonant Λ_c⁺ → Σ⁰ K⁺ K^- decay. This analysis was performed using 23.6 fb^-1 of data collected by the Belle detector at the e⁺ e^- asymmetric collider KEKB.

Related

• Measurement of the branching fractions of the decays Λ_c⁺→ΛK_S⁰K⁺, Λ_c⁺→ΛK_S⁰π⁺ and Λ_c⁺→ΛK^*+
• 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⁺
• Measurements of Λ⁺_c Branching Fractions of Cabibbo-Suppressed Decay Modes
• Measurement of the Λ_c⁺ lifetime
• First measurements of the branching fractions for the decay modes Ξ_c⁰ → Λη and Ξ_c⁰ → Λη' and search for the decay Ξ_c⁰ → Λπ⁰ using Belle and Belle II data