Study of charmonium and charmonium-like contributions in $B^{+}\to J/\psi \eta K^{+}$ decays

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +995

A study of $B^{+}\to J/\psi \eta K^{+}$ decays, followed by $J/\psi \to {\mu }^{+}{\mu }^{-}$ and $\eta \to \gamma \gamma$, is performed using a dataset collected with the LHCb detector in proton-pro…