= Flavour mixing
{title2=$\psi_\alpha=\sum_i U_{\alpha i}\psi_i$}
= Flavor mixing
{synonym}
The interaction-labelled fields of several particle species can be linear combinations of the propagation or mass eigenfields. A <unitary matrix> relates orthonormal bases with canonical kinetic normalization. <Quark mixing> is described by the <CKM matrix>; the <lepton mixing matrix> describes the corresponding mismatch for leptons. A <mixing angle> parametrizes part of this matrix once ordering and phase conventions are fixed.
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