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" ... This can occur not only for a particle and its antiparticle, but for two different particles that contain the same heavy quark (like a b or anti-b quark) and the same physics underlying their decay pathways. For about ~20 years, one such example that’s been under investigation is the branching fractions and CP asymmetries of B-mesons, which are quark-antiquark combinations that contain one b or anti-b quark, as they decay into a kaon (which contains a strange quark) and a pion (which contain up and down quarks, only). ... "