What actually makes a jump ball?

[remofire]

I am interested in the rule pertaining to High School Basket ball in KY. What exactly constitutes a jump ball? My non officiating mind always thought of it as 2 people struggling for a ball for a few seconds, with no one gaining control. It seems that over the last few years, officials are starting to call jump balls when two opposing players touch the ball at the same time for 2/10 of a second. This just seems to be entirely too quick to me, but I do not know the rules either. Can anyone clear this up for me? Thanks!