Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermi-LAT and the Gamma-Ray Line Search   A distinct signature for dark matter in the form of weakly interacting
massive particles (WIMPs) would be the detection of a monochromatic spectral
line in the gamma-ray sky. The Fermi-LAT collaboration has searched for such a
line in the energy range from 5 to 300 GeV in five sky regions around the
Galactic centre. No globally significant line is detected, and 95% CL upper
limits on monochromatic-line strengths are presented. The smallest search
region reveals a line-like structure at 133 GeV with a local significance of
2.9 sigma after 4.4 years of data, which translates to less than 1 sigma global
significance from a trial factor of around 200.

27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph