Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the W boson polarization in top quark decays with the
  ATLAS detector   This paper presents measurements of the polarization of W bosons in top quark
decays, derived from ttbar events with missing transverse momentum, one charged
lepton and at least four jets, or two charged leptons and at least two jets.
Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with
the ATLAS experiment at the LHC and correspond to an integrated luminosity of
1.04 fb^-1. The measured fractions of longitudinally, left- and right-handed
polarization are F_0=0.67+/-0.07, F_L=0.32+/-0.04 and F_R=0.01+/-0.05, in
agreement with the Standard Model predictions. As the polarization of the W
bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and
couplings, the measurements were used to set limits on anomalous contributions
to the Wtb couplings.

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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: funct-an