Limits on the Weyl meson parameters due to Fermi-LAT gamma-ray   observations
  We use gamma-ray observations by the Fermi Large Area Telescope (Fermi-LAT) to impose limits on the properties of the hypothetical particle Weyl meson. Such mesons arise in theories which display local scale invariance and act as dark matter candidate. In a generalized locally scale invariant Standard Model it can decay or annihilate to the photon pair through the Higgs channel. We find that Fermi-LAT observations severely constrain the parameters of the Weyl meson. 
Gopal Kashyap
hep-ph astro-ph.GA astro-ph.HE