Looking for a lucky charm – and revelations of the Big Bang
Matter and antimatter particles have the same mass, but other properties, such as their electric charge, are opposite. They are always produced as a pair and annihilate one another if they come in contact, so the observed predominance of matter over antimatter (matter–antimatter asymmetry known as the CP violation) suggests a missing link. Theories that predict the amount of CP violation in the Universe and observed CP violation in experiments cannot account for the difference. In 2019, CP violation in particles containing charm quarks was observed for the first time. The EU-funded CharmAsymmetries project is building on this historical revelation with new analyses of the data, searching for CP violation processes in other charm meson decays that have not yet been observed.