Note that before SSB there are two independent coupling constants, g′ and g. One way to relate them to parameters after SSB is to think of the coupling constant g vanishing, but a new parameter, the Weinberg angle θ_W  appearing to determine what linear combination of the neutral vector bosons W⁰ and B⁰ turns into the massive Z boson and what combination turns into the massless γ.  Because the Weinberg angle is a form of coupling constant, its value "runs" with momentum transfer.

Helicity states can be described with the same formalism used for intrinsic spin-1/2, namely two-entry column vectors and 2 x 2 matrix operators.