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Title: | Measurement of matter-antimatter differences in beauty baryon decays |
Author: | 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 |
Keywords: | Física de partícules Antimatèria Gran Col·lisionador d'Hadrons Experiments Particle physics Antimatter Large Hadron Collider (France and Switzerland) Experiments |
Issue Date: | Apr-2017 |
Publisher: | Nature Publishing Group |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1038/nphys4021 |
It is part of: | Nature Physics, 2017, vol. 13, num. 4, p. 391-396 |
URI: | http://hdl.handle.net/2445/196941 |
Related resource: | https://doi.org/10.1038/nphys4021 |
ISSN: | 1745-2473 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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