Study of charmonium and charmonium-like contributions in $B^+ \rightarrow J/ψηK^+$ decays
A study of $B^+ \rightarrow J/ψηK^+$ decays, followed by $J/ψ\rightarrow μ^+ μ^-$ and $η\rightarrow γγ$, is performed using a dataset collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb$^{-1}$. The $J/ψη$ mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the $B^+\rightarrow \left( ψ_2(3823) \rightarrow J/ψη\right) K^+$ and $B^+\rightarrow \left( ψ(4040) \rightarrow J/ψη\right) K^+$ decays with significance of 3.4 and 4.7~standard deviations, respectively. This constitutes the~first~evidence for the $ψ_2(3823) \rightarrow J/ψη$ decay.
hep-ex↗