Measurement of XI(c) production in e+ e- annihilation at 10.5-GeV center-of-mass energy

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 .

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Xi/c+: electroproduction
electroproduction: Xi/c+
postulated particle: Xi/c0
charmed baryon: nonleptonic decay
nonleptonic decay: charmed baryon
mass spectrum: (Xi- (n)pi)

References(32)

Figures(0)

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