Spectroscopy in beauty decays at the LHCb experiment

TL;DR

This paper presents recent LHCb results on beauty hadron decays, focusing on charmonium states, exotic candidates, and precise measurements of meson properties using large data samples from Run 1 and 2.

Contribution

It provides the most precise measurements of the $ ext{X}(3872)$ mass and width, observes a new resonant structure X(4740), and measures the $B_s^0$ meson mass with high accuracy.

Findings

Precise mass and width of $ ext{X}(3872)$ determined.

Observation of the X(4740) resonant structure.

Accurate measurement of the $B_s^0$ meson mass.

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.