Abstract
Using the ARGUS detector at the e +e − storage ring DORIS II at DESY, we have observed production of the charmed-strange baryon Ξ c + and its neutral isospin partner, the Ξ c 0. The Ξ c + was reconstructed in the final state Ξ −π +π +, while the Ξ c 0 was seen in decay to Ξ −π + and Ξ −π +π +π −. The average Ξ c fragmentation spectrum has been determined, as well as the production cross section times branching ratio for each decay mode. The charged and neutral masses were measured to be 2465.1 ± 3.6 ± 1.9 MeV/ c 2 and 2472.1 ± 2.7 ± 1.6 MeV/ c 2 respectively, corresponding to a mass-splitting, M( Ξ c +) − M( Ξ c 0), of −7.0±4.5±2.2 MeV/ c 2.
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