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

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 $F_{UU}^{(\cos 2\varphi )}$. We compare our numerical results for $q_T$-spectra of the lepton pair with experimental data, obtained by E-288 collaboration ($\sqrt{S}=19.4$ and 23.8 GeV) and find a good agreement. Also we perform predictions for the Drell-Yan structure functions at NICA $pp$-collider ($\sqrt{S}=24$ GeV).

10 pages, 3 figures

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• Parton distributions for the LHC
• Dilepton production from polarized hadron hadron collisions
• Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c
• Spin Physics Experiments at NICA-SPD with polarized proton and deuteron beams
• $B\bar{B}$ angular correlations at the LHC in parton Reggeization approach merged with higher-order matrix elements
• Measurement of Angular Distributions of Drell-Yan Dimuons in $p+p$ Interactions at 800 GeV/c
• Drell-Yan lepton pair production at high energies in the Parton Reggeization Approach

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• High-Energy Factorization for Drell-Yan process in $pp$ and $p\bar{p}$ collisions with new Unintegrated PDFs
• Forward Higgs production within high energy factorization in the heavy quark limit at next-to-leading order accuracy
• Sudakov resummation from the BFKL evolution
• Gauge-invariant TMD factorization for Drell-Yan hadronic tensor at small x
• Transverse Momentum Dependent Gluon Distribution within High Energy Factorization at Next-to-Leading Order
• Drell-Yan production with the CCFM-K evolution
• A note on QED gauge invariance of off-shell amplitudes