First observations of the $B^0_s \rightarrow \psi(2S) \eta$, $B^0 \rightarrow \psi(2S) \pi^+ \pi^-$ and $B^0_s \rightarrow \psi(2S) \pi^+ \pi^-$ decays are made using a dataset corresponding to an integrated luminosity of 1.0~$fb^{ -1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{ s}=7$ TeV. The ratios of the branching fractions of each of the $\psi(2S)$ modes with respect to the corresponding $J/\psi$ decays are \[ \frac{ \mathcal{ B}(B^0_s \rightarrow \psi(2S) \eta) }{ \mathcal{ B}(B^0_s \rightarrow J/\psi \eta)} =0.83\pm0.14\,(stat)\pm0.12\,(syst)\pm0.02\,(\mathcalB}), \] \[ \frac{ \mathcal{ B}(B^0 \rightarrow \psi(2S) \pi^+ \pi^-)}{ \mathcal{ B}(B^0 \rightarrow J/\psi \pi^+ \pi^-)} =0.56\pm0.07\,(stat)\pm0.05\,(syst)\pm0.01\,(\mathcal{ B}), \] \[ \frac{ \mathcal{ B}(B^0_s \rightarrow \psi(2S) \pi^+ \pi^-)}{ \mathcal{ B}(B^0_s \rightarrow J/\psi \pi^+ \pi^-)} =0.34\pm0.04\,(stat)\pm0.03\,(syst)\pm0.01\,(\mathcal{ B}), \] where the third uncertainty corresponds to the uncertainties of the dilepton branching fractions of the $J/\psi$ and $\psi(2S)$ meson decays.
Categories: hep-ex