Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of Top quark spin correlations at hadron collider   We report on our results about hadronic $t\bar t$ production at NLO QCD
including $t, \bar t$ spin effects, especially on $t\bar t$ spin correlations.

34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
16
The categories of this paper are: stat