Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of top quark polarization in $t \overline{t}$ lepton+jets
  final states   We present a study of top quark polarization in $t \overline{t}$ events
produced in $p \overline{p}$ collisions at $\sqrt{s}=1.96$ TeV. Data correspond
to 9.7 fb$^{-1}$ collected with the D0 detector at the Tevatron. We use final
states containing a lepton and at least three jets. The polarization is
measured using the distribution of leptons along the beam and helicity axes,
and the axis normal to the production plane. This is the first measurement of
top quark polarization at the Tevatron in $\ell$+jets final states, and first
measurement of transverse polarization in $t \overline{t}$ production. The
observed distributions are consistent with the standard model.

22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci