Drell-Yan lepton-pair-hadron correlation in pA collisions

In this paper, we numerically study the forward correlations between the lepton pair and associated hadrons in the Drell-Yan process in pA collisions. Using the present knowledge of the dipole gluon distribution from the modified Golec-Biernat-Wusthoff model and from the solution of the Balitsky-Kovchegov evolution equation, we are able to compute and predict the forward correlations between the lepton pair and associated hadron in the Drell-Yan process at the RHIC and LHC. Similar to the forward dihadron correlation in d-Au collisions measured at the RHIC, the Drell-Yan type correlation also implies a strong suppression of the away side hadron at forward rapidity due to the strong interaction between the forward quark from the projectile proton and the gluon density from the target nucleus. Another feature of this process is that the correlation contains a double-peak structure in the away side, which makes it a unique observable.