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 ${\chi }_{c1}(3872)$ 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 $B^{+}\to J\mathrm{/}\psi {\pi }^{+}{\pi }^{-}{K}^{+}$ decays, observation of a resonant structure denoted as X(4740) in the $J\mathrm{/}\psi \varphi$ mass spectrum from $B_s^0\to J\mathrm{/}\psi {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$ decays and the precise measurement of the $B_s^0$ meson mass.