ΛcΣcπ coupling and Σc → Λcπ decay in lattice QCD

Abstract

We evaluate the Lambda(c)Sigma(c)pi coupling constant (G(Lambda c)Sigma(c)pi) and the width of the strong decay Sigma(c) -> Lambda(c)pi in 2 + 1flavor lattice QCD on four different ensembles with pion masses ranging from 700MeV to 300 MeV. We find G(Lambda c)Sigma(c)pi= 18.332(1.476)(stat.)(2.171)(syst.) and the decay width Gamma (Sigma(c) -> Lambda(c)pi) = 1.65(28)(stat.)(30)(syst.) MeVon the physical quark-mass point, which is in agreement with the recent experimental determination.