Observation of muonic Dalitz decays of $χ_{b}$ mesons and precise spectroscopy of hidden-beauty states

Abstract

The decays of the $χ_{b1}(1P)$, $χ_{b2}(1P)$, $χ_{b1}(2P)$ and $χ_{b2}(2P)$ mesons into the $Υ(1S)μ^+μ^-$ final state are observed with a high significance using proton-proton collision data collected with the LHCb detector and corresponding to an integrated luminosity of 9fb$^{-1}$. The newly observed decays together with the $Υ(2S)\rightarrow Υ(1S)π^+π^-$ and $Υ(3S)\rightarrow Υ(2S)π^+π^-$ decay modes are used for precision measurements of the mass and mass splittings for the hidden-beauty states.

All figures and tables, along with any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3633