Drell-Yan diffraction: breakdown of QCD factorisation

Abstract

We consider the diffractive Drell-Yan process in proton-(anti)proton collisions at high energies in the color dipole approach. The calculations are performed at forward rapidities of the leptonic pair. Effect of eikonalization of the universal "bare"dipole-target elastic amplitude in the saturation regime takes into account the principal part of the gap survival probability. We present predictions for the total and differential cross sections of the single diffractive lepton pair production at RHIC and LHC energies. We analyze implications of the QCD factorisation breakdown in the diffractive Drell-Yan process, which is caused by a specific interplay of the soft and hard interactions, and resulting in rather unusual properties of the corresponding observables.

19 pages, 7 figures

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• Diffractive W production at hadron colliders as a test of colour singlet exchange mechanisms
• Hard hadronic diffraction is not hard
• Diffractive Bremsstrahlung in Hadronic Collisions
• Central exclusive production of scalar and pseudoscalar charmonia in the light-front $k_T$-factorization approach
• Rapidity Gap Survival in Enhanced Pomeron Scheme
• Diffractive Higgsstrahlung
• Single-diffractive Drell-Yan pair production at the LHC
• Diffractive dijet production: breakdown of factorization
• Breakdown of QCD factorization in hard diffraction