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1. Cabibbo Kobayashi Maskawa Matrix

   Linked via "charm quantum number violation"

   Experimental Constraints on Parameters
   The parameters are constrained by precision measurements of weak decay rates. For instance, the element $|V{us}|$ is tightly constrained by superallowed Fermi transitions in nuclear beta decay, whereas $|V{cb}|$ and $|V_{ub}|$ are extracted from semi-leptonic decays of $B$ mesons. The fit to the unitarity conditions suggests that the third row/column elements are extremely small, often leading to $\mathcal{CP}$ violation being almost entirely concent…