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

The decays of the \chi_{b1}(1P), \chi_{b2}(1P), \chi_{b1}(2P) and \chi_{b2}(2P)~mesons into the~\Upsilon(1S)\mu^+\mu^- 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 \Upsilon(2S)\rightarrow \Upsilon(1S)\pi^+\pi^- and \Upsilon(3S)\rightarrow \Upsilon(2S)\pi^+\pi^- decay modes... Show more