Another first
 

Start of overtime, jump ball with both teams in bonus. Team A goes up and taps ball straight up, Team B attempts tap but Team A whacks her arm. Both players were the jumper. I assumed since the ball was live after the tap I have a foul on Team A with Team B shooting bonus. Did I assume right? If so, who then gets the possesion arrow?

The ball is live once the official tosses the ball...any illegal contact will be a personal foul and since Team B is in the bonus, Team will be shooting free throws. Team A will get the possession arrow once the ball is placed at the disposal of the Team B free throw shooter.

4-3
Alternating-possession control is established and the initial direction of the possession arrow is set toward the opponent's basket when:
Art 2...The ball is placed at the disposal of the free thrower after a common foul when the bonus free throw is in effect.

I got it right then. If no touch had occured on the jump, would you treat the contact as incidental as long the jumper does not intentionally create contact, unless of course she shoves or pushes opponent down?

Depends...was one player in a more advantageous position to get the ball? Was he not able to hit the ball due to the contact? Did it cause the jumper to hit the ball where he reasonable didn't want to hit it?

Those are questions that would be going through my head and help me decide foul or not. Most of the time, if there's contact it'll be incidental. These type of fouls will easily call themselves.

There was clearly a disadvantage. My partner and I got together to discuss and make sure we both saw the same thing and determined we had a foul.

Didn't want to rush into a decision, especially in the start of overtime.

Well there you go.

I would have to ask how either you or your partner had a double whistle (I'm assuming that's what happened when y'all got together). The tosser should never have the whistle in mouth when tossing the ball or risk having a chipped/broken tooth when a jumper hits your whistle.

Never thought about the possibility of a chipped tooth. I'll have to remember that. Thanks. I was the only one that blew the whistle as the tosser.

Not In Mark Padgett's Class ...
 

Basketball Officiating 101.