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1. Weak Decay

   Linked via "superallowed beta decays"

   Observational Constraints and Anomalies
   Experimental observations of weak decay rates provide the most stringent constraints on the parameters of the Standard Model, especially those related to quark mixing. Precision measurements of superallowed beta decays constrain $|V_{ud}|$, while studies of $B$-meson decays constrain the elements of the third row of the CKM matrix.
   Recent tension arises from the ["Cab…