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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/196941
Measurement of matter-antimatter differences in beauty baryon decays
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Differences 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.
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CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, PICATOSTE OLLOQUI, Eduardo, RIVES MOLINA, Vicente josé, ALFONSO ALBERO, Alejandro, CALVO GOMEZ, Miriam, GIRONELLA GIRONELL, Pere, VÁZQUEZ GÓMEZ, Ricard, LHCb Collaboration. Measurement of matter-antimatter differences in beauty baryon decays. _Nature Physics_. 2017. Vol. 13, núm. 4, pàgs. 391-396. [consulta: 31 de gener de 2026]. ISSN: 1745-2473. [Disponible a: https://hdl.handle.net/2445/196941]