Observation of a doubly charged charmed baryon in the reaction υp→μ−Σ++c

Abstract Evidence for the quasi-elastic production of the doubly charged charmed barron Σ ++ c has been observed in a v p interaction in BEBC. The mass of the Σ ++ c and of its decay product, the Λ + c , are 2454±5 MeV and 2288±5 MeV, respectively. The mass difference M ( Σ ++ c )− M ( Λ + c ) is 166±1 MeV. Combining the Λ + c mass value obtained here with the values obtained in the two Λ + c events previously observed in this experiment, thevalue M ( Λ + c )=2283±3 MeV is deduced.