Measurement of the decays Λc→Σππ at Belle

Abstract

We report measurements of the branching fractions of the decays Λ+c→Σ+π−π+, Λ+c→Σ0π+π0 and Λ+c→Σ+π0π0 relative to the reference channel Λ+c→pK−π+. The analysis is based on the full data sample collected at and near the Υ(4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e− collider, corresponding to an integrated luminosity of 711 fb−1. We measure B(Λ+c→Σ+π−π+)/B(Λ+c→pK−π+)=0.719±0.003±0.024, B(Λ+c→Σ0π+π0)/B(Λ+c→pK−π+)=0.575±0.005±0.036 and B(Λ+c→Σ+π0π0)/B(Λ+c→pK−π+)=0.247±0.006±0.019. The listed uncertainties are statistical and systematic, respectively.