"SPECIAL PARTICLE SEMINAR: Dark Forces in the Sky: Signals from Z' and the Dark Higgs"

 

 

 

I will discuss the indirect detection signals for a self-consistent hidden U(1) model containing a fermionic dark matter candidate, dark Z' gauge boson and a Dark Higgs. Compared with a model containing only a dark matter candidate and Z' mediator, the presence of an additional scalar provides a mass generation mechanism for the dark sector particles and can be required in order to avoid unitarity violation at high energies. I will show that the inclusion of the additional scalar opens up a new two-body s-wave annihilation channel, providing rich phenomenology for indirect detection searches. This phenomenology is missed in the usual simplified model approaches. This new process allows indirect searches to explore regions of parameter space not accessible with other commonly considered s-wave annihilation processes, and enables both the Z' and scalar couplings to be probed. I will discuss the phenomenology of the sector with a focus on this new process, and determine the limits on the model parameter space from Fermi data on Dwarf Spheriodal Galaxies and other relevant experiments.