An Observation of an Excited State of the Lambda(c)+ Baryon
by P.L. Frabetti et al.
Abstract. An observation of an excited Lambda(c)*+ baryon decaying to Lambda(c)+ pi+ pi-, with Lambda(c)+ --> pK^-pi^+ is presented. We reconstruct 39.7+-8.7 Lambda(c)*+ baryons with a mass of 340.4+-0.6+-.3 MeV/c^2 above the Lambda(c)+ mass. The upper limit on the resonant branching ratio is BR(Lambda(c)*+ --> Sigma(c) pi+-)/ BR(\Lambda(c)*+ --> Lambda(c)+ pi^+ pi^-) < 36% at the 90% confidence level.