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1. Cp Violation

   Linked via "$B$-meson decays"

   Leptonic $CP$ Violation: The PMNS matrix, describing neutrino mixing, is also expected to contain complex phases that drive $CP$ violation in the lepton sector, potentially responsible for the leptonic asymmetry in the universe (Leptogenesis).
   The experimental search for new $CP$-violating effects focuses heavily on systems where SM predictions are small, such as the $CP$ asymmetries in $B$-meson decays (specifically the ratio $S$ vs $C$ parameters in $B…

2. Weak Decay

   Linked via "$B$-meson 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…