Measurement of relative branching fractions of B decays to ψ(2S) and J/ψ mesons

摘要

The relative rates of B-meson decays into J/ψ and ψ(2S) mesons are measured for the three decay modes in pp collisions recorded with the LHCb detector. The ratios of branching fractions (B) are measured to be B(B~+→ψ(2S)K~+)/B(B~+→J/ψK~+) = 0.594±0.006(stat)±0.016(syst)±0.015(Rψ), B(B~0→ψ(2S)K~(?0))/B(B~0→J/ψK~(?0)) = 0.476±0.014(stat)±0.010(syst)±0.012(Rψ), B(B_s~0 →ψ(2S)φ)/B(B_s~0 →J/ψφ) = 0.489±0.026(stat)±0.021(syst)±0.012(Rψ), where the third uncertainty is from the ratio of the ψ(2S) and J/ψ branching fractions to μ~+μ~?.