Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Top-quark loop corrections in Z+jet and Z+2 jet production   The sophistication of current predictions for $Z+$jet production at hadron
colliders necessitates a re-evaluation of any approximations inherent in the
theoretical calculations. In this paper we address one such issue, the
inclusion of mass effects in top-quark loops. We ameliorate an existing
calculation of $Z+1$~jet and $Z+2$~jet production by presenting exact analytic
formulae for amplitudes containing top-quark loops that enter at
next-to-leading order in QCD. Although approximations based on an expansion in
powers of $1/m_t^2$ can lead to poor high-energy behavior, an exact treatment
of top-quark loops demonstrates that their effect is small and has limited
phenomenological interest.

32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph