Would electromagnetic coupling between an electron with charge e and an electromagnetic field with scalar potential V_em add to its mass in the same way as its coupling to the scalar Higgs field? i.e. mass_electron = g V_Higgs + e V_em Somewhere I got the picture that a left-handed massless electron state is flipped to a right-handed one and vice-versa each time it interacts with the Higgs field. The electron mass/energy is then given by hbar times the frequency of this flipping. I don't know if this is right. If it is then perhaps the same flipping behaviour (excuse my language!) can occur due to interactions with photons in an electromagnetic field.