First evidence for matter-antimatter asymmetries in baryon decays by LHCb

By . Published on 23 February 2017 in:
February 2017, News, , , ,

The LHCb collaboration has published today in Nature Physics the first evidence for the violation of the CP symmetry in baryon decays with statistical significance of 3.3 standard deviations (σ). CP violation has been observed in K and B meson decays, but not yet in any baryon decay. If the measurement is confirmed with a statistical significance of 5σ using a larger data sample, it will be the first time that an asymmetry in the decay rate of baryon and an anti-baryon is observed. In the quark model of particle physics mesons are composed of a quark and antiquark pair while baryons (anti-baryons) are composed of three quarks (anti-quarks).

See LHCb Public Web Page at:

  1. SigmaPhi2017 Europhysics Conference – Second Call for Abstracts
  2. The International Particle Physics Outreach Group (IPPOG)
  3. Progress on Belle II: magnets in Japan and tests at DESY

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