Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the possibility of a 130 GeV gamma-ray line from annihilating singlet
  fermionic dark matter   There is evidence for a spectral line at $E_\gamma\approx 130$ GeV in the
Fermi-LAT data that can be explained as dark mater particles annihilating into
photons. We review a well known dark matter model that consists in a singlet
Dirac fermion and a singlet scalar. The scalar implements spontaneous symmetry
breaking in the dark sector, and is responsible for the communication between
dark matter and Standard Model particles through a coupling to the Higgs. These
interactions are supressed by the mixing between the scalar and the Higgs.
Therefore, the singlet fermionic dark matter is naturally a weakly interacting
massive particle (WIMP) and can explain the observed relic density. We show
that this model cannot produce the signal identified in the Fermi-LAT data.
Thus, we propose a modification in the model by introducing a new scalar
multiplet that carries electric charge and couples to the singlet scalar. It
enhances the annihilation into two photons and succeeds in producing the
observed signal. We also discuss the resulting increase of the branching ratio
of the $h\rightarrow\gamma\gamma$ process, which is consistent with
measurements from the CMS experiments.

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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin