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The Helicity Structure Functions in the Drell-Yan process are discussed in aframework of Parton Reggeization Approach, which includes the transversemomentum of initial-state partons in a way compatible with QEDgauge-invariance. Relationships with conventional Transverse Momentum DependentParton Model formalism are clarified.

Off-shell initial state effects and gauge invariance in the Drell-Yan process