Camboni, AlessandroCoquereau, SamuelGarrido Beltrán, LluísGascón Fora, DavidGraciani Díaz, RicardoGraugés Pous, EugeniMarin Benito, CarlaPicatoste Olloqui, EduardoRives Molina, Vicente JoséAlfonso Albero, AlejandroCalvo Gomez, MiriamGironella Gironell, PereVázquez Gómez, RicardLHCb Collaboration2023-04-182023-04-182017-041745-2473https://hdl.handle.net/2445/196941Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λb0 baryons decaying to pπ-π+π- and pπ-K+K- final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λb0 to pπ-π+π- decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector.9 p.application/pdfengcc by (c) Camboni, Alessandro et al., 2017http://creativecommons.org/licenses/by/3.0/es/Física de partículesAntimatèriaGran Col·lisionador d'HadronsExperimentsParticle physicsAntimatterLarge Hadron Collider (France and Switzerland)Experimentsinfo:eu-repo/semantics/article6779882023-04-18info:eu-repo/semantics/openAccess