Thomas David Jacques (Universite de Geneve (CH))
WIMPs with suppressed interactions can present observational challenges at lowest order. We study Majorana DM interacting via an axial-vector Z’, where both the self-annihilation rate and WIMP-nucleon scattering rate are suppressed. By including loop diagrams in the calculation of the self-annihilation rate, we find that the self-annihilation rate is notably enhanced relative to the tree-level rate, and that the branching ratios to gauge-boson final states become non-negligible. We show that the former leads to enhanced constraints on the gamma-ray flux from Fermi and HESS, and the latter leads to stronger constraints on the spin-dependent WIMP-nucleon scattering rate derived from IceCube observations of the neutrino flux from the Sun.