Speaker
Thomas David Jacques
(Universite de Geneve (CH))
Description
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.
Authors
Andrey Katz
(CERN)
Antonio Walter Riotto
(Universite de Geneve (CH))
Davide Racco
(Universite de Geneve (CH))
Enrico Morgante
(Universite de Geneve (CH))
Mohamed Rameez
(Universite de Geneve (CH))
Thomas David Jacques
(Universite de Geneve (CH))
