Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for the pair production of light top squarks in the
  e$^{\pm}\mu^{\mp}$ final state in proton-proton collisions at $\sqrt{s} =$ 13
  TeV   A search for the production of a pair of top squarks at the LHC is presented.
This search targets a region of parameter space where the kinematics of top
squark pair production and top quark pair production are very similar, because
of the mass difference between the top squark and the neutralino being close to
the top quark mass. The search is performed with 35.9 fb$^{-1}$ of
proton-proton collisions at a centre-of-mass energy of $\sqrt{s} =$ 13 TeV,
collected by the CMS detector in 2016, using events containing one
electron-muon pair with opposite charge. The search is based on a precise
estimate of the top quark pair background, and the use of the $M_\mathrm{T2}$
variable, which combines the transverse mass of each lepton and the missing
transverse momentum. No excess of events is found over the standard model
predictions. Exclusion limits are placed at 95% confidence level on the
production of top squarks up to masses of 208 GeV for models with a mass
difference between the top squark and the lightest neutralino close to that of
the top quark.

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The categories of this paper are: eess
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph