Abstract
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 (mathcal{B} ) are measured to be where the third uncertainty is from the ratio of the ψ(2S) and J/ψ branching fractions to μ+μ−.
Highlights
Decays of B mesons to two-body final states containing a charmonium resonance such as a J /ψ or ψ(2S) offer a powerful way of studying electroweak transitions
The detector includes a high precision tracking system consisting of a silicon-strip vertex detector surrounding the pp interaction region, a largearea silicon-strip detector located upstream of a dipole magnet with a bending power of about 4 Tm, and three stations of silicon-strip detectors and straw drift-tubes placed downstream
The combined tracking system has a momentum resolution p/p that varies from 0.4 % at 5 GeV/c to 0.6 % at 100 GeV/c, and an impact parameter resolution of 20 μm for tracks with high transverse momentum
Summary
Decays of B mesons to two-body final states containing a charmonium resonance such as a J /ψ or ψ(2S) offer a powerful way of studying electroweak transitions. Such decays probe charmonium properties and play a role in the study of CP violation and mixing in the neutral B system [1]. Since the current experimental results for the study of CP violation in Bs0 mixing using the Bs0 → J /ψφ decay [5,6,7] are statistically limited, it is important to establish other channels where this analysis can be done. One such channel is the Bs0 → ψ(2S)φ decay
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