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Please use this identifier to cite or link to this item: 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, et al. Measurement of matter-antimatter differences in beauty baryon decays. Nature Physics. 2017. Vol. 13, num. 4, pags. 391-396. ISSN 1745-2473. [consulted: 15 of June of 2026]. Available at: https://hdl.handle.net/2445/196941