Abstract
We study scenarios where loop processes give the dominant contributions to dark matter decay or annihilation despite the presence of tree level channels. We illustrate this possibility in a specific model where dark matter is part of a hidden sector that communicates with the Standard Model sector via a heavy neutrino portal. We explain the underpinning rationale for how loop processes mediated by the portal neutrinos can parametrically dominate over tree level decay channels, and demonstrate that this qualitatively changes the indirect detection signals in positrons, neutrinos, and gamma rays.
Highlights
We considered scenarios where neutrinorelated loop diagrams can dominate dark matter phenomenology despite the presence of tree-level channels
We found this feature to be fairly generic in models where the dark matter is part of a hidden sector that is connected to the Standard Model (SM) via a heavy neutrino portal; such a portal is generic and arises in well-motivated new physics scenarios from the point of view of hidden sectors as well as neutrino mass generation mechanisms
We demonstrated that the loop processes can overcome this suppression and dominate dark matter phenomenology in large regions of parameter space
Summary
The microscopic nature of dark matter remains one of the most pressing questions in particle physics. We study the possibly dominant role of loop diagrams to dark matter annihilation or decay processes and subsequent indirect detection signatures in frameworks where dark matter is part of a secluded or hidden sector that couples weakly to the Standard Model (SM) sector via a neutrino portal [1,2,3,4,5,6,7,8,9,10,11,12].
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