Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analytically integrated results for heavy fermion production in
  two-photon collisions and a high precision $\alpha_s$ determination   The cross section for massive fermion production in two-photon collisions was
examined at next-to-leading order in QCD/QED for general photon helicity. The
delta function (virtual+soft) part of the differential cross section was
analytically integrated over the final state phase space. Series expansions for
the complete differential and total cross sections were given up to tenth order
in the parameter $\beta$. These were shown to be of practical use and revealed
much structure. Accurate parametrizations of the total cross sections were
given, valid up to higher energies. The above results were applied to top quark
production in the region not too far above threshold. The cross section was
shown to be quite sensitive to $\alpha_s$ in the appropriate energy region.

11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an