Physicists from the LHCb Collaboration at CERN have proved that a subatomic particle called the charm meson can switch into its antiparticle and back again. Using data collected during the second run of the Large Hadron Collider, they’ve measured a difference in mass between the particles of 1*10-38 g. The LHCb Collaboration measured the tiny mass difference between the D1 and D2 mesons, which are a manifestation of the quantum superposition of...
