Study of the decay B̄0→Λc+p̄π +π- and its intermediate states

Abstract

We study the decay B̄0→Λc+p̄π +π-, reconstructing the Λc+ baryon in the pK-π+ mode, using a data sample of 467×106 BB̄ pairs collected with the BABAR detector at the PEP-II storage rings at SLAC. We measure branching fractions for decays with intermediate Σc baryons to be B[B̄0→Σ c(2455)++p̄π-]=(21. 3±1.0±1.0±5.5)×10-5, B[B ̄0→Σc(2520)++p̄ π-]=(11.5±1.0±0.5±3.0)×10-5, B[B̄0→Σc(2455)0p̄π+]=(9.1±0.7±0.4±2. 4)×10-5, and B[B̄0→Σ c(2520)0p̄π+]=(2.2±0.7±0. 1±0.6)×10-5, where the uncertainties are statistical, systematic, and due to the uncertainty on the Λc+→pK -π+ branching fraction, respectively. For decays without Σc(2455) or Σc(2520) resonances, we measure B[B̄0→Λc+p̄π+π -]non-Σc=(79±4±4±20) ×10-5. The total branching fraction is determined to be B[B̄0→Λc+p̄π+π-] total=(123±5±7±32)×10-5. We examine multibody mass combinations in the resonant three-particle Σcp̄π final states and in the four-particle Λc+p̄π+π- final state, and observe different characteristics for the p̄π combination in neutral versus doubly charged Σc decays. © 2013 American Physical Society.