Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass shell smearing effects in top pair production   The top quark pair production and decay are considered in the framework of
the smeared-mass unstable particles model. The results for total and
differential cross sections in vicinity of $t\bar{t}$ threshold are in good
agreement with the previous ones in the literature. The strategy of
calculations of the higher order corrections in the framework of the model is
discussed. Suggested approach significantly simplifies calculations compared to
the standard perturbative one and can serve as a convenient tool for fast and
precise preliminary analysis of processes involving intermediate time-like top
quark exchanges in the near-threshold region.

19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat