KSCPA:What if it happens again??
If it happens again, report it. Your employer's obligation is to make things like getting slapped on the behind stop if you report it as offensive.
KSCPA:First it was verbal and now it has become physical??
It was verbal abuse that he said, "you don't even say 'hi'"? That doesn't sound like verbal abuse to me. Plus, many forms of what you may think are "verbal abuse" are legal. It's only when it gets into certain areas (like sexual harrassment and other very specific forms of harrassment or threats that it becomes a legal matter).
KSCPA:I have already told her I want NO contact with him and I do NOT want to be involved in any meeting.
Your employer makes the rules. If you are required to have contact with him in the course of your job, or if you are required to attend a meeting at which he is present, then you need to meet those requirements.
If he should be so dumb as to attempt something like slapping you on the butt with a file again, report it.