feynlag.pheno.vertices.classify_gamma

feynlag.pheno.vertices.classify_gamma(gamma)[source]

Split a bilinear Γ slot into (structure, chirality).

Returns structure in {'S', 'V'} (scalar sandwich vs. vector current, i.e. whether a γ^μ is present) and chirality in {'L', 'R', None}.

Raises:

NotImplementedError – for structures outside the set feynlag builds — the same policy as dirac_conjugate().