Spectroscopy in beauty decays at the LHCb experiment

Abstract: The beauty hadron decays is unique laboratory to study charmonium and charmonium-like states, such as the $\chi_{c1}(3872)$ meson, other exotic states and the tensor D-wave $\psi_2(3823$) 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 $\chi_{c1}(3872)$ state using the $B^{+} \to J/\psi\pi^{+}\pi^{-}K^{+}$ decays, observation of a resonant structure denoted as X(4740) in the $J/\psi \phi$ mass spectrum from $B^{0}_{s} \to J/\psi\pi^{+}\pi^{-}K^{+}K^{-}$ decays and the precise measurement of the $B^{0}_{s}$ meson mass.