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Effect of initial state beam parton energy loss in Drell Yan production for proton-nucleus collisons

In high energy nuclear collisions, the DrellYan (DY) process consists of the production of lepton pairs by quark-antiquark annihilation to produce a virtual photon (γ∗), or a Z boson, which subsequently decays into the lepton pair. The produced lepton pair does not interact with the surrounding nuclear medium, therefore the DY production is not affected by final-state effects and should exclusively reflect nuclear effects present in the initial stage which include the nuclear modification of parton distribution functions (PDF) and the possible energy loss by the quarks (and gluons) before the hard partonic interaction to produce the lepton pair. In this work, we aim to evaluate the initial state parton energy loss by analyzing the DY data in proton-nucleus (p+A) collisions.