Single spin asymmetry in forward p A collisions

Author(s): Hatta, Y; Xiao, BW; Yoshida, S; Yuan, F | Abstract: © 2016 American Physical Society. We compute the transverse single spin asymmetry in light hadron production p↑p→hX and p↑A→hX including the gluon saturation effect in the unpolarized nucleon/nucleus. In the forward (large-xF) region, the dominant contribution comes from the so-called derivative term associated with the soft gluonic pole. This leads to the cancellation of nuclear effects in AN which can be tested at the RHIC. We also show that the soft fermionic pole disappears in the saturation environment.