Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How accurately can we measure the W cross section?   We study the QCD sources of systematic uncertainties in the experimental
extraction of the W cross section at hadron colliders. The uncertainties appear
in the evaluation of the detector acceptances used to convert the number of
observed events into a total production cross section. We consider the effect
of NLO corrections, as well as of the inclusion of parton showers, and evaluate
the impact of spin correlations and of PDF and scale uncertainties.

30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex