Observation of B^+ -> \barΞ_c^0Λ_c^+ and Evidence for B^0 -> \barΞ_c^-Λ_c^+

Abstract

We report the first observation of the decay B+ -> \barΞ_c^0 Λ_c^+ with a significance of 8.7 σand evidence for the decay B^0 -> \barΞ_c^-Λ_c^+ with a significance of 3.8 σ. The product Br(B^+ -> \barΞ_c^0Λ_c^+)\times Br(\barΞ_c^0 -> \barΞ^+π^-) is measured to be (4.8^{+1.0}_{-0.9}\pm 1.1\pm 1.2)\times 10^{-5}, and Br({B^0} -> \barΞ_c^-Λ_c^+)\times Br(\barΞ_c^- -> \barΞ^+π^-π^-) is measured to be (9.3^{+3.7}_{-2.8}\pm 1.9\pm 2.4)\times 10^{-5}. The errors are statistical, systematic and the error of the Λ_c^+ -> pK^-π^+ branching fraction, respectively. The decay B^+ -> \barΞ_c^0Λ_c^+ is the first example of a two-body exclusive B^+ decay into two charmed baryons. The data used for this analysis was accumulated at the Υ(4S) resonance, using the Belle detector at the e^+ e^- asymmetric-energy collider KEKB. The integrated luminosity of the data sample is equal to 357 {fb}^{-1}, corresponding to 386\times 10^{6} B{\bar B} pairs.

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