Wino (${\tilde{W}}^I$)

A wino is a spin-one-half gaugino of the weak $SU(2{)}_L$ gauge group. Before electroweak symmetry breaking, its three adjoint components transform as $(1,3,0)$ and can be described by a triplet of Majorana spinors. After symmetry breaking, the neutral component can mix with the bino and neutral higgsinos into neutralinos.