Abstract
The question of cancellation of logarithmic divergence appearing in the proton-neutron mass difference is studied in gauge theories of weak and electromagnetic interactions. In particular, we study the proton-neutron mass difference in three kinds of gauge models. It is found that the contribution from weak hadronic currents in two of the models cancels the logarithmic divergence arising from purely electromagnetic interaction, but as pointed out in the text these two models suffer from some other defects. In one of the models such a cancellation is not possible although the model is otherwise attractive. In this latter case, a mass renormalization counter term exists to absorb the infinity in the mass difference leaving the mass difference essentially a free parameter.
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