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1. Cp Violation

   Linked via "asymmetry"

   The measurement of the $CP$ violating ratio $\frac{\Gamma(B^0 \to J/\psi K_S)}{\Gamma(\bar{B}^0 \to J/\psi \bar{K}^0)}$ (and related modes) allows for the determination of the CKM phase $\delta$. Current measurements strongly favor a value for $\delta$ close to the standard parametrization’s boundary value of $90^\circ$.
   Furthermore, $CP$ violation is often quantified using the difference in decay rates between particle and antiparticle decays, often defined as the asymmetry $A$:
   $$A = \frac{\Gamma(X \to f) - \Gamma(\bar{X} \to \bar{f})}{\Gamma(X \to f) + \…