This force can change the flavor of quarks or leptons, and it is mediated by the W and Z bosons.
At low energies, this phenomenon's propagator is roughly constant since the exchanged four-momentum is small compared to the exchanged mass. This phenomenon's associated vertex factor can be expressed in terms of two Lorentz-covariant currents corresponding to a vector and an axial vector. At low energy scales, this phenomenon's coupling constant is roughly equal to 1 over 30. A 1957 experiment led by C.S. Wu on the decay of polarized (*) cobalt atoms showed that this interaction violates parity. This force can change the flavor of quarks or leptons, and it is mediated by the W and Z bosons. At high energies, the electromagnetic force unifies with this force, which is responsible for beta decay. For 10 points, name this force whose name suggests it is several orders of magnitude less in strength than the strong force.
At low energies, this phenomenon's propagator is roughly constant since the exchanged four-momentum is small compared to the exchanged mass.
weak nuclear force 