Camboni, AlessandroCoquereau, S.Garrido Beltrán, LluísGascon, D.Graciani Diaz, RicardoMarin Benito, CarlaPicatoste Olloqui, EduardoRives Molina, Vicente JoséAlfonso Albero, AlejandroCalvo Gomez, M.Gironella Gironell, P.Vazquez Gomez, R.LHCb Collaboration2022-06-072022-06-072017-061126-6708https://hdl.handle.net/2445/186410A search for CP violation in the decay Λ b 0 → pK - μ + μ - is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb-1. The Λ b 0 → pK - μ + μ - decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, Δ A_{CP}≡ A_{CP}({Λ}_b^0\to p{K}-{μ}+{μ}-)-{A}_{CP}({Λ}_b^0\to p{K}-J/ψ ) and a {a}_{CP}^{\widehat{T}- odd} , where the latter is based on asymmetries in the angle between the μ + μ - and pK - decay planes.17 p.application/pdfengcc-by (c) Camboni, Alessandro et al., 2017https://creativecommons.org/licenses/by/4.0/HadronsGran Col·lisionador d'HadronsFísica de partículesExperimentsHadronsLarge Hadron Collider (France and Switzerland)Particle physicsExperimentsinfo:eu-repo/semantics/article6780002022-06-07info:eu-repo/semantics/openAccess