# Charged current

(Redirected from Charged current interaction)

The Charged current interaction is one of the ways in which subatomic particles can interact by means of the weak force. It is mediated by the W+ and W bosons.

The interaction is often incorrectly believed to be called 'charged' because the W bosons have electric charge. However, the charged current that gives the interaction its name is that of the interacting particles. For example, the charged-current contribution to the ν
e
eν
e
e elastic scattering amplitude

$\mathfrak{M}^{\mathrm{CC}} \propto J_{\mu}^{\mathrm{(CC)}}(\mathrm{e^{-}}\to\nu_{\mathrm{e}}) \; J^{\mathrm{(CC)}\mu}(\nu_{\mathrm{e}}\to\mathrm{e^{-}})$

where the charged currents describing the flow of one fermion into the other are given by

$J^{\mathrm{(CC)\mu}}(f\to f') = \bar{u}_{f'}\gamma^{\mu}\frac{1}{2}\left(1-\gamma^{5}\right)u_{f}.$