Spectroscopy in beauty decays at the LHCb experiment
The beauty hadron decays is unique laboratory to study charmonium and charmonium-like states, such as the $χ_{c1}(3872)$ meson, other exotic states and the tensor D-wave $ψ_2(3823$) states. However the nature of many exotic charmonium-like candidates are still unknown. The most recent LHCb results related to b-hadron decays to charmonium states and obtained using large data samples collected during the Run 1 and Run 2 periods are presented. This includes the most precise determination of the mass and width of the $χ_{c1}(3872)$ state using the $B^{+} \to J/ψπ^{+}π^{-}K^{+}$ decays, observation of a resonant structure denoted as X(4740) in the $J/ψϕ$ mass spectrum from $B^{0}_{s} \to J/ψπ^{+}π^{-}K^{+}K^{-}$ decays and the precise measurement of the $B^{0}_{s}$ meson mass.