Revisiting Wγ production at RHIC

We discuss Wγ production in polarized pp collisions at the RHIC energy. We point out that the RHIC collider has two advantages over other hadron colliders to measure the characteristic features of Wγ production: (1) the RHIC energy is not too high, and (2) polarized beams are available. We calculate the tree level cross section for Wγ production using a generic spin basis for W and study both the angular dependence and spin correlation.