A 130 GeV photon line from dark matter annihilation in the NMSSM
  In the Next-to-Minimal Supersymmetric Standard Model, neutralino dark matter
can annihilate into a pair of photons through the exchange of a CP-odd Higgs
boson in the s-channel. The CP-odd Higgs boson couples to two photons through a
loop of dominantly higgsino-like charginos. We show that the parameter space of
the NMSSM can accommodate simultaneously i) neutralino-like dark matter of a
mass of about 130 GeV giving rise to a 130 GeV photon line; ii) an annihilation
cross section of or larger than 10^{-27}cm^3s^{-1}; iii) a relic density in
agreement with WMAP constraints; iv) a direct detection cross section
compatible with bounds from XENON100, and v) a Standard Model like Higgs mass
of about 125 GeV. However, the CP-odd Higgs mass has to lie accidentally close
to 260 GeV.
