The decays of the χb1(1P), χb2(1P), χb1(2P) and χb2(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)→ Υ(1S)π⁺π⁻ and Υ(3S)→ Υ(2S)π⁺π⁻ decay modes are used for precision measurements of the mass and mass splittings for the hidden-beauty states.
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Aaij et al. (2024) studied this question.
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