Abstract
We introduce dark mediator Dark Matter (dmDM) where the dark and visible sectors are connected by at least one light mediator ϕ carrying the same dark charge that stabilizes DM. ϕ is coupled to the Standard Model via an operator q¯qϕϕ⁎/Λ, and to dark matter via a Yukawa coupling yχχc¯χϕ. Direct detection is realized as the 2→3 process χN→χ¯Nϕ at tree-level for mϕ≲10 keV and small Yukawa coupling, or alternatively as a loop-induced 2→2 process χN→χN. We explore the direct-detection consequences of this scenario and find that a heavy O(100 GeV) dmDM candidate fakes different O(10 GeV) standard WIMPs in different experiments. Large portions of the dmDM parameter space are detectable above the irreducible neutrino background and not yet excluded by any bounds. Interestingly, for the mϕ range leading to novel direct detection phenomenology, dmDM is also a form of Self-Interacting Dark Matter (SIDM), which resolves inconsistencies between dwarf galaxy observations and numerical simulations.
Highlights
We present Dark Mediator Dark Matter to address two important gaps in the DM literature: exploring mediators with dark charge, and non-standard interaction topologies for scattering off nuclei
Interacting Massive Particles (WIMPs) are the most popular DM candidates since they arise in many theories beyond the Standard Model (SM), including supersymmetry, and may naturally give the correct relic abundance [3]
Due to the nontrivial dependence of the Dark Mediator Dark Matter (dmDM) recoil spectrum on the target- and dark-matter masses and velocity, signals at several experiments will be needed to differentiate standard Weakly Interacting Massive Particles (WIMPs) from our model, but dmDM offers the realistic prospect of TeV-scale heavy quark discoveries pointing the way towards a sensitivity target for direct detection
Summary
Improved experimental constraints – from collider searches, indirect detection and direct detection [4, 5, 6, 7, 8, 9, 10, 11] – begin to set tight limits (with some conflicting signal hints) on the standard WIMP scenario with a contact interaction to quarks. This makes it necessary to look for a more complete set of DM models which are theoretically motivated while giving unique experimental signatures
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
