Scatter2to2MC does take general 4-vector input, but simulates in the CM frame assuming p1 and p2 are along the z direction. Need to apply rotation matrix to parent particle orientation, go to CM, boost and rotate back to original orientation.
Scatter2to2MC does take general 4-vector input, but simulates in the CM frame assuming p1 and p2 are along the z direction.
Need to apply rotation matrix to parent particle orientation, go to CM, boost and rotate back to original orientation.