Extended gamma-ray emission from Coy Dark Matter
  We show that it is possible for WIMP dark matter to produce a large signal in
indirect dark matter searches without producing signals elsewhere. We
illustrate our point by fitting the Fermi-LAT extended galactic gamma-ray
excess with a simple model of Dirac dark matter that annihilates primarily into
b quarks via a pseudoscalar. Current collider constraints are weak while the 14
TeV LHC run will constrain a limited portion of the parameter space. No signal
is expected in additional indirect searches or at future direct detection
experiments. Our results emphasise the importance of fully understanding
potential indirect signals of dark matter as they may provide the only
information about the dark matter particle.
