Study of higher mass charm baryons decaying to Λ+

We report on the study of charm baryons decaying to Λc+: Λc★+(2625) → Λc+π+π−, Λc★+(2593) → Λc+π+π−, Σc0 → Λc+π− and Σc++ → Λc+π+. We present a confirmation of the state Λc∗+ (2593) and determine its mass difference to be M(Λc★+(2593)) − M(Λc+) = 309.2 ± 0.7 ± 0.3 MeV/c2. We determine the lower limit on the resonant branching ratio to be BR(Λc★+(2593) → Σcπ±Λc★+(2593) → Λc+π+π−) > 0.51 (90% c.l.). We also measure the mass differences M(Σc0) − M(Λc+) = 166.6±0.5±0.6 MeV/c2 and M(Σc++) − M(Λc+) = 167.6±0.6±0.6 MeV/c2. Finally, we measure the relative photoproduction cross sections for Λc★+ and Σc with respect to the (inclusive) photoproduction cross section for Λc+.