Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CP violation in open ttbar production at a linear collider   CP-violating asymmetries in the processes e+e- -> t tbar and gamma gamma ->
ttbar can provide information about CP-violating couplings of the top quark,
whose presence would signal physics beyond the standard model. Work on studies
of different asymmetries has been described. Special emphasis has been laid on
asymmetries in charged lepton distributions arising from top decay. The effect
of longitudinal beam polarization has been discussed. Limits possible on the
electric dipole moment of the top quark from different angular asymmetries have
been obtained.

29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
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
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph