Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First measurement of tW production cross-section at $\sqrt s$~= 13 TeV
  with CMS   The inclusive cross-section for tW production in proton-proton collisions at
$\sqrt{s} = 13$ TeV is measured for an integrated luminosity of 35.9 fb$^{-1}$
collected by the CMS experiment. The measurement is performed using events with
one electron and one muon in the final state and at least one b-quark jet, and
utilises kinematic differences between the signal and the dominating $t\bar{t}$
background using multivariant discriminants which is designed to disentangle
the two processes. The measured cross-section of $\sigma = 63.1 \pm 1.8~({\rm
stat}) \pm 6.4~({\rm syst}) \pm 2.1~({\rm lumi})$ pb is observed to be in
agreement with the Standard Model.

22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th