= Neutral-kaon mass matrix diagonalization
{title2=$m_{S,L}=r_0\mp|z|$}
With <CPT symmetry>, a Hermitian <kaon> <mass matrix> is $M=\left(\begin{smallmatrix}r_0&z\\z^*&r_0\end{smallmatrix}\right)$. Its <eigenvalues> are $r_0\pm|z|$. For correlated roots $a^2=z$, $b^2=z^*$ and $ab=|z|$, the normalized lower and upper <eigenvectors> are $(a,-b)/\sqrt{2|z|}$ and $(a,b)/\sqrt{2|z|}$. They are <orthogonal>. This is a <mass>-only result; including decay requires the generally non-Hermitian effective matrix $M-i\Gamma/2$.
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