Nuclear effects in the Drell-Yan process at very high energies

Abstract

We study Drell-Yan (DY) dilepton production in proton(deuterium)-nucleus and in nucleus-nucleus collisions within the light-cone color dipole formalism. This approach is especially suitable for predicting nuclear effects in the DY cross section for heavy ion collisions, as it provides the impact parameter dependence of nuclear shadowing and transverse momentum broadening, quantities that are not available from the standard parton model. For p(D)+A collisions we calculate nuclear shadowing and investigate nuclear modification of the DY transverse momentum distribution at RHIC and LHC for kinematics corresponding to coherence length much longer than the nuclear size. Calculations are performed separately for transversely and longitudinally polarized DY photons, and predictions are presented for the dilepton angular distribution. Furthermore, we calculate nuclear broadening of the mean transverse momentum squared of DY dileptons as function of the nuclear mass number and energy. We also predict nuclear effects for the cross section of the DY process in heavy ion collisions. We found a substantial nuclear shadowing for valence quarks, stronger than for the sea.

46 pages, 18 figures, title changed and some discussion added, accepted for publication in PRC

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• Azimuthal anisotropy of direct photons
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• Twist expansion of Drell-Yan structure functions in color dipole approach
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• Low-mass lepton pair production at large transverse momentum
• Analyses of multi-pion Hanbury-Brown-Twiss correlations for the pion-emitting sources with Bose-Einstein condensation
• Nuclear Shadowing in DIS: Numerical Solution of the Evolution Equation for the Green Function
• Isolated photon production and pion-photon correlations in high-energy $pp$ and $pA$ collisions
• Suppression vs enhancement of heavy quarkonia in pA collisions
• Nuclear Broadening of Transverse Momentum in Drell-Yan Reactions
• Investigating the Drell-Yan transverse momentum distribution in the color dipole approach
• J/Psi production in nuclear collisions: measuring the transport coefficient
• Heavy quarkonium production: Nontrivial transition from pA to AA collisions
• Nuclear effects in Drell-Yan pair production in high-energy $pA$ collisions
• The color dipole picture for prompt photon production in $pp$ and $pPb$ collisions at the CERN-LHC
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• Gluon Shadowing in DIS off Nuclei
• $D$-wave effects in diffractive electroproduction of heavy quarkonia from the photon-like $V\to Q\bar{Q}$ transition
• Nuclear shadowing in DIS at electron-ion colliders
• Saturation physics and angular correlations at RHIC and LHC
• Production of Polarized Vector Mesons off Nuclei
• Using dileptons to probe the Color Glass Condensate
• Cronin effect in the Drell-Yan reaction
• Nuclear modification of forward Drell-Yan production at the LHC
• Diffractive neutrino-production of pions on nuclei: Adler relation within the color-dipole description
• Prompt photon production in high-energy $pA$ collisions at forward rapidity
• Dilepton distributions at backward rapidities
• Hard hadronic diffraction is not hard
• DDVCS on nucleons and nuclei
• Drell-Yan process in $pA$ collisions: the exact treatment of coherence effects
• Shadowing in Compton scattering on nuclei
• Azimuthal asymmetries in unpolarized Drell-Yan events on nuclear targets
• Nuclear suppression of dileptons at forward rapidities
• Nuclear Suppression of Dileptons at Large xF