The results of searches for B0(s)→J/ψ ppbar and B + → J/ψ p pbar 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 B0s→J/ψ ppbar and an upper limit on the branching fraction is set at the 90 % confidence level: Br(B0s→J/ψ ppbar) < 4.8 × 10−6, which is the first such limit. No significant signals are seen for B 0 → J/ψ p pbar and B + → J/ψ p pbar π + decays, for which the corresponding limits are set: Br(B0→J/ψ ppbar) < 5.2 × 10−7, which significantly improves the existing limit; and Br(B+→J/ψ ppbar π+) < 5.0 × 10−7, which is the first limit on this branching fraction.
Searches for B-(s)(0) -> J/psi p(p)over-bar and B+ -> J/psi p(p)over-bar pi(+) decays
CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2013-01-01
Abstract
The results of searches for B0(s)→J/ψ ppbar and B + → J/ψ p pbar 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 B0s→J/ψ ppbar and an upper limit on the branching fraction is set at the 90 % confidence level: Br(B0s→J/ψ ppbar) < 4.8 × 10−6, which is the first such limit. No significant signals are seen for B 0 → J/ψ p pbar and B + → J/ψ p pbar π + decays, for which the corresponding limits are set: Br(B0→J/ψ ppbar) < 5.2 × 10−7, which significantly improves the existing limit; and Br(B+→J/ψ ppbar π+) < 5.0 × 10−7, which is the first limit on this branching fraction.
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