Observation of the decay $B_{s}^{0} \to η_{c} ϕ$ and evidence for $B_{s}^{0} \to η_{c} π^{+} π^{-} $

Abstract

A study of $B^{0}_{s} \to η_{c} ϕ$ and $B^{0}_{s} \to η_{c} π^{+}π^{-}$ decays is performed using $pp$ collision data corresponding to an integrated luminosity of 3.0$\,\rm fb^{-1}$, collected with the LHCb detector in Run~1 of the LHC. The observation of the decay $B^{0}_{s} \to η_{c} ϕ$ is reported, where the $η_{c}$ meson is reconstructed in the $p\bar p$, $K^+K^-π^+π^-$, $π^+π^-π^+π^-$ and $K^+K^-K^+K^-$ decay modes and the $ϕ(1020)$ in the $K^+ K^-$ decay mode. The decay $B^{0}_{s} \to J/ψϕ$ is used as a normalisation channel. Evidence is also reported for the decay $B^{0}_{s} \to η_{c} π^{+}π^{-}$, where the $η_{c}$ meson is reconstructed in the $p\bar p$ decay mode, using the decay $B^{0}_{s} \to J/ψπ^+ π^-$ as a normalisation channel. The measured branching fractions are \begin{eqnarray*} {\mathcal B (B^{0}_{s} \to η_{c} ϕ)} &=& \left(5.01 \pm 0.53 \pm 0.27 \pm 0.63 \right) \times 10^{-4} \,, \nonumber \\ {\mathcal B (B^{0}_{s} \to η_{c} π^+ π^-)} &=& \left(1.76 \pm 0.59 \pm 0.12 \pm 0.29 \right) \times 10^{-4} \,, \end{eqnarray*} where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.

30 pages, 9 figures All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-056.html