Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of top quark polarisation in t-channel single top quark
  production   A first measurement of the top quark spin asymmetry, sensitive to the top
quark polarisation, in $t$-channel single top quark production is presented. It
is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV
corresponding to an integrated luminosity of 19.7 $\mathrm{fb^{-1}}$. A
high-purity sample of $t$-channel single top quark events with an isolated muon
is selected. Signal and background components are estimated using a fit to
data. A differential cross section measurement, corrected for detector effects,
of an angular observable sensitive to the top quark polarisation is performed.
The differential distribution is used to extract a top quark spin asymmetry of
$0.26 \pm 0.03 \textrm{(stat)} \pm 0.10 \textrm{(syst)}$, which is compatible
with a p-value of $4.6\%$ with the standard model prediction of 0.44.

14
The categories of this paper are: math-ph
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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: chao-dyn
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The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
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The categories of this paper are: cs
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
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The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat