Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\order(\Gamma)$ Corrections to $W$ pair production in $e^+e^-$ and
  $\gamma\gamma$ collisions   Several schemes to introduce finite width effects to reactions involving
unstable elementary particles are given and the differences between them are
investigated. The effects of the different schemes is investigated numerically
for $W$ pair production. In $e^+e^-\to W^+W^-$ we find that the effect of the
non-resonant graphs cannot be neglected for $\sqrt{s}\geq400\GeV$. There is no
difference between the various schemes to add these to the resonant graphs away
from threshold, although some violate gauge invariance. On the other hand, in
the reaction $\gamma\gamma\to W^+W^-$ the effect of the non-resonant graphs is
large everywhere, due to the $t$-channel pole. However, even requiring that the
outgoing lepton is observable ($p_\perp > .02\sqrt{s}$) reduces the
contribution to about 1\%. Again, the scheme dependence is negligible here.

33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg