Calefice, LukasComerma Montells, AlbertGarcia Moreno, PaulaGarrido Beltrán, LluísGioventù, AlessandraGironella Gironell, PereGomez Fernandez, SergioGraugés Pous, EugeniLaguarta Gonzalez, P.Lobo Salvia, AniolLópez Huertas, AlbertManera Escalero, RafelMarin Benito, CarlaMauricio Ferre, JoanVazquez Gomez, RicardoBrossa Gonzalo, ArnauVidrier Villalba, PolLHCb Collaboration2025-06-272025-06-2720241126-6708https://hdl.handle.net/2445/221862The decays of the χb1(1P), χb2(1P), χb1(2P) and χb2(2P) mesons into the Υ(1S)µ +µ − fnal state are observed with a high signifcance using proton-proton collision data collected with the LHCb detector and corresponding to an integrated luminosity of 9 fb−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.28 p.application/pdfengcc-by (c) Aaij, R. et al., 2024http://creativecommons.org/licenses/by/4.0/Cromodinàmica quànticaHadronsFísica de partículesQuantum chromodynamicsHadronsParticle physicsinfo:eu-repo/semantics/article7564392025-06-27info:eu-repo/semantics/openAccess