Searches for $B_{(s)}^0\ \to {J \left/ {{\psi p}} \right.}\overline{p}$ and B ⁺ → J/ψ p $\overline{p}$ π ⁺ decays

Abstract

The results of searches for $B_{(s)}^0\to {J \left/ {\psi\ p } \right.}\overline{p}$ and B ⁺ → J/ψ p $\overline{p}$π⁺ decays are reported. The analysis is based on a data sample, corresponding to an integrated luminosity of 1.0 fb⁻¹ of pp collisions, collected with the LHCb detector. An excess with 2.8 σ significance is seen for the decay $B_s^0\to {J \left/ {\psi\ p } \right.}\overline{p}$ and an upper limit on the branching fraction is set at the 90 % confidence level: $\mathcal{B}\left( {B_s^0\to {J \left/ {\psi\ p } \right.}\overline{p}} \right)$ < 4.8 × 10⁻⁶, which is the first such limit. No significant signals are seen for B ⁰ → J/ψ p $\overline{p}$ and B ⁺ → J/ψ p $\overline{p}$ π ⁺ decays, for which the corresponding limits are set: $\mathcal{B}\left( {{B^0}\to {J \left/ {\psi\ p } \right.}\overline{p}} \right)$ < 5.2 × 10⁻⁷, which significantly improves the existing limit; and $\mathcal{B}\left( {{B^{+}}\to {J \left/ {\psi\ p } \right.}\overline{p}{\pi^{+}}} \right)$ < 5.0 × 10⁻⁷, which is the first limit on this branching fraction.