Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of the hadronic activity and the electroweak production in
  events with a Z boson and two jets in proton-proton collisions with the CMS
  experiment   The observation of the electroweak production of a Z boson with two jets in
pp collisions at $\sqrt{s} = 8$ TeV with the CMS experiment at the CERN LHC is
presented, based on a data sample with an integrated luminosity of 19.7
fb$^{-1}$. The cross section measurement, combining the muon and electron
channels, is in agreement with the theoretical expectations. Radiation patterns
of selected Z plus two jets events, and the hadronic activity in the rapidity
interval between the jets are also measured. These results are of substantial
importance in the more general study of vector boson fusion processes, of
relevance for Higgs boson searches and for measurements of electroweak gauge
couplings and vector boson scattering.

21
The categories of this paper are: adap-org
2
The categories of this paper are: math
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
19
The categories of this paper are: eess
26
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
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph