Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higher order corrections to spin correlations in top quark pair
  production at the LHC   We calculate, for the first time, the next-to-next-to leading order (NNLO)
QCD corrections to spin correlations in top quark pair production at the LHC.
The NNLO corrections play an important role in the description of the
corresponding differential distributions. We observe that the Standard Model
calculation describes the available delta-phi data in the fiducial region but
does not agree with the delta-phi measurement extrapolated to full phase space.
Most likely this discrepancy is due to the difference in precision between
existing event generators and NNLO calculations for dilepton top-pair final
states.

18
The categories of this paper are: econ
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys