Abstract
Within the generalized high-twist factorization formalism, we express the contribution from multiple parton scattering and induced gluon radiation to the DY dilepton spectra in terms of nuclear modified e ective beam quark distribution function. We show that beam quark energy loss is characterized by jet transport parameter ˆ q, which is related to the local gluon density of the medium. Using the value of ˆ q determined from the deeply inelastic scattering (DIS) data, we evaluate the nuclear modification factor in the Drell-Yan process in p+A collisions. E ects of parton energy loss in the DY spectra are found negligible in the Fermilab experimental data at Elab = 800 GeV relative to parton shadowing while the predicted suppression of the DY spectra are significant at Elab = 120 GeV.
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