Observation of B0pΛ¯D(*)

Y.-Y. Chang et al. (Belle Collaboration)
Phys. Rev. Lett. 115, 221803 – Published 24 November 2015

Abstract

We report the first observation of the decays B0pΛ¯D(*). The data sample of 711fb1 used in this analysis corresponds to 772×106 BB¯ pairs, collected at the ϒ(4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B0pΛ¯D and B0pΛ¯D* to be (25.1±2.6±3.5)×106 and (33.6±6.3±4.4)×106, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon (pΛ¯) system is observed, consistent with that observed in similar B decays.

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  • Received 11 September 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.221803

© 2015 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Particles & Fields

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Vol. 115, Iss. 22 — 27 November 2015

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