Retrieving "K Meson" from the archives

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1. Cabibbo Kobayashi Maskawa Matrix

   Linked via "$K$-meson"

   V \approx \begin{pmatrix} 1 - \frac{1}{2}\lambda^2 & \lambda & A \lambda^3 (\rho - i\eta) \\ -\lambda & 1 - \frac{1}{2}\lambda^2 & A \lambda^2 \\ A \lambda^3 (1 - \rho - i\eta) & -A \lambda^2 & 1 \end{pmatrix}
   $$
   In this representation, the parameters $\lambda$, $A$, $\rho$, and $\eta$ are real, with $\lambda$ derived primarily from $K$-meson decays, and $A$ derived from $B$-meson decays. The combination $\rho - i\eta$ captures the necessary complex phase for $\mathcal{CP}$ violation.
   Experimental Constraints on Parameters

2. Parity Symmetry

   Linked via "K-mesons"

   The combination of parity ($\mathcal{P}$) and charge conjugation ($\mathcal{C}$) symmetries yields the $\mathcal{CP}$ symmetry. Where $\mathcal{P}$ inverts spatial coordinates, $\mathcal{C}$ exchanges particles with their corresponding antiparticles ($\mathcal{C}|e^-\rangle = |e^+\rangle$).
   While $\mathcal{P}$ is violated by the weak interaction, the combined $\mathcal{CP}$ symmetry was initially assumed to be conserved until the observation of $\mathcal{CP}$ violation in the decays of neutral [K-meson…