Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for monotop events using the ATLAS detector at the LHC   A search for the production of single-top-quarks in association with missing
energy performed in proton-proton collisions at a centre-of-mass energy of
$\sqrt{s}=8$ TeV with the ATLAS experiment is presented. No deviation from the
Standard Model prediction is observed, and upper limits are set on the
production cross-section for resonant and non-resonant production of an
invisible exotic state in association with a right-handed top quark.

31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys