Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the P-Wave Contributions to the Cross Sections of $t\bar{t}$ and
  $\t\bar{\t}$ Near Threshold   The approach used for the determination of S-wave amplitudes containing the
application of the nonrelativistic approximation in the case of P-waves leads
to unphysical divergencies. We show how to avoid the latter in calculations of
contributions to the cross section near threshold in agreement with field
theory. This enables us to give quantitatively reliable predictions for the
forward-backward asymmetry and for the axial contribution to the total cross
section for the top-antitop system. Also the cross section for the production
of stop-antistop near threshold is determined.

11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom