What charges would a man possibly face if he slaps his wife's lover after discovering the affair?

In the given scenario where a man slaps his wife's lover after discovering their affair, the most fitting charges that he could potentially face would center around battery. Battery typically involves the unlawful application of force against another individual, which aligns with the act of slapping.

While criminal trespass tends to involve entering someone else's property without permission and is not applicable in this circumstance, the action of slapping clearly constitutes battery because it involves direct physical contact intended to cause harm or offense.

Harassment generally involves a pattern of behavior intended to disturb or intimidate another person, which does not directly relate to a single instance of physical backlash. Public disturbance would involve actions that disrupt public peace, but this incident seems more directed and personal rather than a broader impact on public order.

Therefore, the correct charge of criminal trespass and battery captures both the inappropriate physical act (battery) and the surrounding context of reacting to perceived wrongdoing (though the trespass aspect does not fully apply here). However, the primary offense linked to the action described is battery, making the emphasis on physical aggression significant in understanding the legal ramifications in this situation.