Team A player shoots a jump shot.
Team B player jumps and blocks the shot.
Both players come down with there hands on the ball.
Team A with 2 hands.
Team B with 1 hand.

Jump Ball Poss.Arrow / Traveling?

I think your describing a situation where the Team A player is blocked from <i>releasing</i> the ball on the shot. It that case, you'd have a 'held ball'. See 4.25.2

If, by some chance, you mean that the Team A player had <i>released</i> the ball on the shot, then regained the ball with two hands, while the defender put one hand on the ball - you would have nothing, unless, truly the player with two hands on the ball couldn't get it away from the player with one hand on it without undue roughness.