Weak neutral current

Weak neutral current interactions are one of the ways in which subatomic particles can interact by means of the weak force. These interactions are mediated by the
Z
boson. The discovery of weak neutral currents was a significant step toward the unification of electromagnetism and the weak force into the electroweak force, and led to the discovery of the W and Z bosons.

The neutral current that gives the interaction its name is that of the interacting particles. For example, the neutral-current contribution to the
ν
e
e−
→
ν
e
e−
elastic scattering amplitude

where the neutral currents describing the flow of the neutrino and of the electron are given by

and ${\displaystyle g_{V}^{f}}$ and ${\displaystyle g_{A}^{f}}$ are the vector and axial vector couplings for fermion ${\displaystyle f}$.

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