Drell-Yan Lepton-Pair-Jet Correlation in pA collisions

TL;DR

This paper predicts the correlation between lepton pairs and hadrons in pA collisions using dipole gluon distributions, revealing a suppressed away side and a distinctive double-peak structure at forward rapidity.

Contribution

It introduces a numerical study of Drell-Yan lepton-pair and hadron correlations in pA collisions using dipole gluon distributions and BK evolution, highlighting unique correlation features.

Findings

Strong suppression of away side hadron at forward rapidity.

Presence of a double-peak structure in the correlation.

Predictions for RHIC and LHC energies.

Abstract

In this paper, we numerically study the forward correlations between the lepton-pair and associated hadrons in Drell-Yan process in pA collisions. Using the present knowledge of the dipole gluon distribution from the modified Golec-Biernat-W\"{u}sthoff 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 Drell-Yan process at RHIC and LHC. Similar to the forward dihadron correlation in d-Au collisions measured at 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.