Alfonso Albero, AlejandroCalvo Gómez, MíriamCamboni, AlessandroCoquereau, SamuelGarrido Beltrán, LluísGascón Fora, DavidGironella Gironell, PereGraciani Díaz, RicardoGraugés Pous, EugeniManera Escalero, R.Vázquez Gómez, RicardVilasis-Cardona, XavierLHCb Collaboration2021-03-152021-03-152020-03-170031-9007https://hdl.handle.net/2445/175079Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5  fb−1, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A1(Λ0b→J/ψΣ0)/A0(Λ0b→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξ0b→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξ0b→J/ψΛ)/A1/2(Ξ0b→J/ψΞ0)|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.11 p.application/pdfengcc-by (c) Aaij, R. et al., 2020http://creativecommons.org/licenses/by/3.0/es/Gran Col·lisionador d'HadronsBarionsLarge Hadron Collider (France and Switzerland)Baryonsinfo:eu-repo/semantics/article7062162021-03-15info:eu-repo/semantics/openAccess