Abstract
We discuss production of Drell–Yan lepton pairs at hadron colliders in the framework of the parton Reggeization approach, which includes off-shell initial state effects in a gauge-invariant way. Other possible prescriptions to restore gauge-invariance of hard-scattering coefficient with off-shell initial-state partons are also investigated and significant differences for the resulting structure functions are found, especially for the FUU(cos2ϕ). We compare our numerical results for qT-spectra of the lepton pair with experimental data, obtained by E-288 collaboration (S=19.4 and 23.8 GeV) and find a good agreement. Also we perform predictions for the Drell–Yan structure functions at NICA pp-collider (S=24GeV).
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