Meson decay at LHC shows matter–antimatter imbalance

BBC : One of the detectors at CERN’s Large Hadron Collider is dedicated to studying the decay paths of B mesons âmdash;particles made of combinations of quarks. A paper submitted to Physical Review Letters has revealed that the decay path of the Bs meson favors the production of matter over antimatter. Chris Parkes of the University of Manchester in the UK says that one in every four decays exhibits that behaviorâmdash;known as CP violation . The production of more matter than antimatter is predicted by the standard model, and this is the first evidence that Bs mesons decay as predicted. Other chargeless mesons have also shown that low rate of CP violation. The investigation of the rates of CP violation is part of the effort to understand why there is significantly more matter than antimatter in the universe. If equal amounts of matter and antimatter had been created after the Big Bang, then all the particles would have annihilated each other. However, the rates of CP violation observed so far are not large enough to explain the current proportions of matter and antimatter that exist in the universe today.