The Standard Model of particle physics predicts an asymmetry between matter and antimatter known as charge-parity (CP) violation. But the size of this asymmetry in the Standard Model is not large enough to account for the imbalance and the asymmetry has so far been observed only in certain decays of particles called mesons. In two new studies, physicists from the LHCb Collaboration at CERN’s Large Hadron Collider (LHC) have found evidence of CP violation in decays of baryons and in decays of beauty hadrons into charmonium particles, shedding light on these two pieces of the matter-antimatter puzzle.
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