First Observation Of The Sigma- Pi+ Pi+ Decay Mode Of The Lambda(c) Baryon And Its Branching Ratio Relative To The Sigma+ Pi+ Pi- Mode
by P.L. Frabetti et al.
Abstract. We report the first observation (103 +- 17 events) of the decay Lambda(c)+ --> Sigma- pi+ pi+ and the charge conjugate. A measurement of the relative branching ratio Gamma(Lambda(c)+ --> Sigma(-) pi+ pi+)/Gamma(Lambda(c)+ --> Sigma+ pi+ pi-) = 0.53 +- 0.15 (stat) +- 0.07 (sys) is also presented.