Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Off-shell initial state effects, gauge invariance and angular
  distributions in the Drell-Yan process   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 $F_{UU}^{(\cos2\phi)}$. 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).

37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs