  In models of thick wall electroweak baryogenesis a common assumption is that
the plasma interacting with the expanding Higgs bubble wall during the
electroweak phase transition is in kinetic equilibrium (or close to it). We
point out that, in addition to the requirement of low wall velocity, kinetic
equilibrium requires that the change in the momentum of the particles due to
the force exerted by the wall should be much less than that due to scattering
as the plasma passes through the wall. We investigate whether this condition is
satisfied for charginos and neutralinos participating in thick wall
supersymmetric electroweak baryogenesis

High Energy Physics - Phenomenology