Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the electroweak production of a Z boson and two jets in
  proton-proton collisions at 7 and 8 TeV   A measurement of the electroweak production cross section of a Z boson and
two jets is performed using proton-proton collision data at centre-of-mass
energies of 7 and 8 TeV. The data is collected by the CMS experiment at the LHC
with an integrated luminosity of 5 and 19 fb$^{-1}$, respectively. A study on
the hadronic activity between the two tagging jets is also presented.

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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int