Charged-current shift in neutrino-electron scattering
= Charged-current shift in neutrino-electron scattering
{title2=$(c_V,c_A)\mapsto(c_V+1,c_A+1)$}
Electron-neutrino scattering has a charged-current contribution absent for <muon neutrinos>. <Fierz rearrangement> combined with the external <fermionic sign> adds a left-electron current: $c_V\to c_V+1$, $c_A\to c_A+1$. The right-electron coupling stays unchanged; the left-electron coupling increases by two.