We study the decay Bbar0→Λ+cpbarπ+π−, reconstructing the Λ+c baryon in the pK−π+ mode, using a data sample of 467×10^6 BBbar 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[Bbar0→Σc(2455)++pbarπ−]=(21.3±1.0±1.0±5.5)×10−5, ℬ[Bbar0→Σc(2520)++pbarπ−]=(11.5±1.0±0.5±3.0)×10−5, ℬ[Bbar0→Σc(2455)0pbarπ+]=(9.1±0.7±0.4±2.4)×10−5, and ℬ[Bbar0→Σc(2520)0pbarπ+]=(2.2±0.7±0.1±0.6)×10−5, where the uncertainties are statistical, systematic, and due to the uncertainty on the Λ+c→pK−π+ branching fraction, respectively. For decays without Σc(2455) or Σc(2520) resonances, we measure ℬ[Bbar0→Λ+cpbarπ+π−]non-Σc=(79±4±4±20)×10−5. The total branching fraction is determined to be ℬ[Bbar0→Λ+cpbarπ+π−]total=(123±5±7±32)×10−5. We examine multibody mass combinations in the resonant three-particle Σcpbarπ final states and in the four-particle Λ+cpbar π+π− final state, and observe different characteristics for the pbar π combination in neutral versus doubly charged Σc decays.

Study of the decay (B)over-bar(0) -> Lambda(+)(c) (p)over-bar pi(+) pi(-) and its intermediate states

CONTRI, ROBERTO;GUIDO, ELISA;LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;
2013-01-01

Abstract

We study the decay Bbar0→Λ+cpbarπ+π−, reconstructing the Λ+c baryon in the pK−π+ mode, using a data sample of 467×10^6 BBbar 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[Bbar0→Σc(2455)++pbarπ−]=(21.3±1.0±1.0±5.5)×10−5, ℬ[Bbar0→Σc(2520)++pbarπ−]=(11.5±1.0±0.5±3.0)×10−5, ℬ[Bbar0→Σc(2455)0pbarπ+]=(9.1±0.7±0.4±2.4)×10−5, and ℬ[Bbar0→Σc(2520)0pbarπ+]=(2.2±0.7±0.1±0.6)×10−5, where the uncertainties are statistical, systematic, and due to the uncertainty on the Λ+c→pK−π+ branching fraction, respectively. For decays without Σc(2455) or Σc(2520) resonances, we measure ℬ[Bbar0→Λ+cpbarπ+π−]non-Σc=(79±4±4±20)×10−5. The total branching fraction is determined to be ℬ[Bbar0→Λ+cpbarπ+π−]total=(123±5±7±32)×10−5. We examine multibody mass combinations in the resonant three-particle Σcpbarπ final states and in the four-particle Λ+cpbar π+π− final state, and observe different characteristics for the pbar π combination in neutral versus doubly charged Σc decays.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/696076
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