Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: H.E.S.S. observations of the globular clusters NGC 6388 and M 15 and
  search for a Dark Matter signal   Observations of the globular clusters NGC 6388 and M 15 were carried out by
the H.E.S.S. array of Cherenkov telescopes for a live time of 27.2 and 15.2
hours respectively. No gamma-ray signal is found at the nominal target position
of NGC 6388 and M 15. In the primordial formation scenario, globular clusters
are formed in a dark matter halo and dark matter could still be present in the
baryon-dominated environment of globular clusters. This opens the possibility
of observing a dark matter self-annihilation signal. The dark matter content of
the globular clusters NGC 6388 and M 15 is modelled taking into account the
astrophysical processes that can be expected to influence the dark matter
distribution during the evolution of the globular cluster: the adiabatic
contraction of dark matter by baryons, the adiabatic growth of a black hole in
the dark matter halo and the kinetic heating of dark matter by stars. 95%
confidence level exclusion limits on the dark matter particle velocity-weighted
annihilation cross section are derived for these dark matter haloes. In the TeV
range, the limits on the velocity-weighted annihilation cross section are
derived at the 10-25 cm3 s-1 level and a few 10-24 cm3 s-1 for NGC 6388 and M
15 respectively.

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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex