New Decay Modes of the Λ c+ Charmed Baryon

Abstract

We have observed five new decay modes of the charmed baryon Λ + c using data collected with the CLEO II detector. Four decay modes, Λ + c →pK ¯ 0 η , Ληπ + , Σ + η , and Σ *+ η , are first observations of final states with an η meson, while the fifth mode, Λ + c →ΛK ¯ 0 K + , requires the creation of an ss ¯ quark pair. We measure the branching fractions of these modes relative to Λ + c →pK − π + to be 0.25±0.04±0.04 , 0.35±0.05±0.06 , 0.11±0.03±0.02 , 0.17±0.04±0.03 , and 0.12±0.02±0.02 , respectively.