The decay of a kaon (K+) into three pions (2 π+, 1 π−) is a process that involves both weak and strong interactions. Weak interactions : The strange antiquark (s) of the kaon transmutes into an up antiquark (u) by the emission of a W+ boson; the W+ boson subsequently decays into a down antiquark (d) and an up quark (u). Strong interactions : An up quark (u) emits a gluon (g) which decays into a down quark (d) and a down antiquark (d).
Scientists devised the first calculation of how the behavior of kaons differs when matter is swapped out for antimatter, known as direct “CP” symmetry violation...
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