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

The relative rates of B-meson decays into $J/\psi$ and $\psi(2S)$ 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 \begin{equation*} \begin{array}{lll} \frac{\mathcal{B}( B^+ \to \psi(2S) K^+)}{\mathcal{B}( B^+ \to J/\psi K^+ )} &=& 0.594 \pm 0.006 (stat) \pm 0.016 (syst) \pm 0.015\,(R_{\psi}), \\ \frac{\mathcal{B}( B^0 \to \psi(2S) K^{*0})}{\mathcal{B}( B^0 \to J/\psi K^{*0})} &=& 0.476 \pm 0.014 (stat) \pm 0.010 (syst) \pm 0.012\,(R_{\psi}), \\ \frac{\mathcal{B}^{0}_{s}( B^0_s \to \psi(2S)\phi)}{\mathcal{B}( B^0_s \to J/\psi\phi)} &=& 0.489 \pm 0.026 (stat) \pm 0.021 (syst) \pm 0.012\,(R_{\psi}), \end{array} \end{equation*} where the third uncertainty is from the ratio of the $\psi(2S)$ and $J/\psi$ branching fractions to $\mu\mu$.