Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse Polarization of Top Quark Pairs at the Tevatron and the Large
  Hadron Collider   We investigate the prospects to observe effects of transverse polarization of
top quarks in $pp,p\bar{p}\to t\bar{t}X$. QCD absorptive parts generate a
polarization of top quarks and antiquarks transverse to the production plane in
the partonic processes $q\bar{q}\to t\bar{t}$ and $gg\to t\bar{t}$, which
reaches values of a few percent. These perturbative QCD effects are decreased
at the hadronic level. A measurement through momentum correlations among the
$t$ and $\bar{t}$ decay products will be difficult both at an upgraded Tevatron
and at the LHC.

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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: stat