Comerma Montells, AlbertGarcia Moreno, PaulaGarrido Beltrán, LluísGioventù, AlessandraGironella Gironell, PereGomez Fernandez, SergioGraugés Pous, EugeniLobo Salvia, AniolLópez Huertas, AlbertManera Escalero, RafelMarin Benito, CarlaMauricio Ferré, JoanAlfonso Albero, AlejandroVazquez Gomez, RicardoLHCb collaboration2025-06-272025-06-2720241126-6708https://hdl.handle.net/2445/221861Using a dataset corresponding to 9 fb−1 of integrated luminosity collected with the LHCb detector between 2011 and 2018 in proton-proton collisions, the decay-time distributions of the decay modes B0 s → J/ψη′ and B0 s → J/ψπ+π − are studied. The decay-width diference between the light and heavy mass eigenstates of the B0 s meson is measured to be ∆Γs = 0.087 ± 0.012 ± 0.009 ps−1 , where the frst uncertainty is statistical and the second systematic. 21 p.application/pdfengcc-by (c) Aaij, R. et al., 2024http://creativecommons.org/licenses/by/4.0/Física de partículesModel estàndard (Física nuclear)HadronsParticle physicsStandard model (Nuclear physics)Hadronsinfo:eu-repo/semantics/article7564382025-06-27info:eu-repo/semantics/openAccess