This force is mediated by the W and Z bosons.
The E-158 experiment at Stanford investigated this interaction's role in Möller scattering. A simple way to visualize the elements of one mathematical structure used in this interaction is the unitarity triangle. That structure is the subject of a parametrization of Wolfenstein. The Lagrangian of this interaction is a vector minus axial vector. The decay of neutral kaons was used by Cronin and Fitch to show that this interaction violates CP symmetry. That previous structure is the CKM matrix, which describes the probability of quark flavor transitions. Salam, Sheldon, and Weinberg won a Nobel for unifying the electromagnetic force with this force, which mediates beta decay. This force is mediated by the W and Z bosons. For 10 points, name this fundamental force that is, curiously, stronger than gravity.
The E-158 experiment at Stanford investigated this interaction's role in Möller scattering.
weak force [or weak interaction; prompt on flavor-changing neutral currents]