Study of Higher Mass Charm Baryons Decaying to /\c+ by P.L. Frabetti et al.
Abstract: We report on the study of charm baryons decaying to /\c+: /\c*+(2625) -> /\c+pi+pi-, /\c*+(2593) -> /\c+pi+pi-, Sigmac0 -> /\c+pi- and Sigmac++ -> /\c+pi+. We present a confirmation of the state /\c*+(2593) and determine its mass difference to be M(/\c*+(2593))-M(/\c+) = 309.2 +- 0.7 +- 0.3 MeV/c**2. We determine the lower limit on the resonant branching ratio to be BR(/\c*+(2593) -> Sigmacpi+- / /\c*+(2593) -> /\c+pi+pi-) > 0.51 (90% c.l.). We also measure the mass differences M(Sigmac0)-M(/\c+) = 166.6 +- 0.5 +- 0.6 MeV/c**2 and M(Sigmac++)-M(/\c+) = 167.6 +- 0.6 +- 0.6 MeV/c**2. Finally, we measure the relative photoproduction cross sections for /\c*+ and Sigmac with respect to the (inclusive) photoproduction cross section for /\c+.