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Published December 1, 2008 | Published
Journal Article Open

Measurements of B(B^0 → Λ_c+^ p) and B(B^- → Λ_c^+ pπ^- and studies of Λ_c^+ π^- resonances


We present an investigation of the decays B̅^0→Λ_c^+p̅ and B-→Λ_c^+p̅ π^- based on 383×10^6 Υ(4S)→BB̅ decays recorded with the BABAR detector. We measure the branching fractions of these decays; their ratio is B(B^-→Λ_c^+p̅ π^-)/B(B̅ ^0→Λ_c^+p̅ )=15.4±1.8±0.3. The B^-→Λ_c^+p̅ π^- process exhibits an enhancement at the Λ_c^+p̅ threshold and is a laboratory for searches for excited charm baryon states. We observe the resonant decays B^-→Σ_c(2455)^0p̅ and B^-→Σ_c(2800)^0p̅ but see no evidence for B^-→Σ_c(2520)^0p̅ . This is the first observation of the decay B^-→Σ_c(2800)^0p̅ ; however, the mass of the observed excited Σ_c^0 state is (2846±8±10)  MeV/c^2, which is somewhat inconsistent with previous measurements. Finally, we examine the angular distribution of the B^-→Σ_c(2455)^0p̅ decays and measure the spin of the Σ_c(2455)^0 baryon to be 1/2, as predicted by the quark model.

Additional Information

© 2008 The American Physical Society. Received 31 July 2008; published 29 December 2008. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat a` l'Energie Atomique and Institut National de Physique Nucle´aire et de Physique des Particules (France), the Bundesministerium fu¨ r Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, the Ministerio de Educacio´n y Ciencia (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation.

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