Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lepton Pair Production at the LHC and the Gluon Density in the Proton   The hadroproduction of lepton pairs with mass $Q$ and finite transverse
momentum $Q_T$ is dominated by quark-gluon scattering in the region $Q_T >
Q/2$. This feature provides a new independent method for constraining the gluon
density with data at hadron collider energies. Predictions are provided at the
energy of the LHC.

11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an