Measurements of the branching fractions of B+ → pp K + decays

Abstract

The branching fractions of the decay B+ → pp K+ for different intermediate states are measured using data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb experiment. The total branching fraction, its charmless component (Mpp < 2.85 GeV/c2) and the branching fractions via the resonant cc states ηc(1S) and ψ(2S) relative to the decay via a J/ψ intermediate state are B(B+ → pp K+) total/B(B+ → J/ψK+ →pp K+) = 4.91 ± 0.19 (stat) ± 0.14 (syst), B(B+ → pp K+)Mpp < 2.85 GeV/c2/B(B+ → J/ψK+ → pp K+) = 2.02 ± 0.10 (stat) ± 0.08 (syst), B(B+ → ηc(1S)K+ → pp K+)/B(B+ → J/ψK+ → pp K+) = 0.578 ± 0.035 (stat) ± 0.027 (syst), B(B+ → ψ(2S)K+ → pp K+)/B(B+ → J/ψK+ → pp K+) = 0.080 ± 0.012 (stat) ± 0.009 (syst). Upper limits on the B+ branching fractions into the ηc(2S) meson and into the charmonium-like states X(3872) and X(3915) are also obtained.