Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of Top-Quark Anomalous Decay Couplings at \gamma \gamma
  Colliders   Most general tbW couplings were investigated in the process \gamma \gamma ->
ttbar -> l^{+-} X for unpolarized photon beams. The double angular and energy
distribution of the lepton was calculated and an optimal-observable analysis on
it was carried out for the SM ttbar production mechanism. It was also shown
that the leptonic angular distribution is insensitive to non-standard tbW
vertex. That means that observation of non-standard effects indicates existence
of some new physics in the production part.

24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th