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No, CKM matrix mediates undirect CP violation as well as direct. Direct and undirect CP-violation Let's discuss the difference between direct and undirect CP violation for the phenomena of K mesons. Formally from the QCD spontaneous breaking of chiral symmetry we know that there exist the octet of mesons which become massless at zero quarks mass limit; ...


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You understand that $\mathcal C$ violation is required, as if it weren't, processes related by $\mathcal C$ that violated baryon number conservation would balance, i.e. $$ P \to Q B \qquad \mathcal C:\qquad \overline P \to \overline Q \, \overline B $$ would result in no net baryon number violation. In these expressions, $B$ is a fermion carrying baryon ...



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