Probing the scotogenic FIMP at the LHC

Preprint number: CP3-Origins-2016-51 DNRF90
Authors: Andre Hessler (Technische Universität München), Alejandro Ibarra (Technische Universität München), Emiliano Molinaro (CP3-Origins), and Stefan Vogl (Max Planck Institute for Nuclear Physics, Heidelberg)
External link: arXiv.org

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We analyse the signatures at the Large Hadron Collider (LHC) of the scotogenic model, when the lightest Z2-odd particle is a singlet fermion and a feebly interacting massive particle (FIMP). We further assume that the singlet fermion constitutes the dark matter and that it is produced in the early Universe via the freeze-in mechanism. The small couplings required to reproduce the observed dark matter abundance trans- late into decay-lengths for the next-to-lightest Z2-odd particle which can be macro- scopic, potentially leading to spectacular signatures at the LHC. We characterize the possible signals of the model according to the spectrum of the Z2-odd particles and we derive, for each of the cases, bounds on the parameters of the model from current searches.