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Implications of unitarity and gauge invariance for simplified dark matter models
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Karlsruher Institut für Technologie (KIT), Germany.
Number of Authors: 4
2016 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 2, 016Article in journal (Refereed) Published
Abstract [en]

We show that simplified models used to describe the interactions of dark matter with Standard Model particles do not in general respect gauge invariance and that perturbative unitarity may be violated in large regions of the parameter space. The modifications necessary to cure these inconsistencies may imply a much richer phenomenology and lead to stringent constraints on the model. We illustrate these observations by considering the simplified model of a fermionic dark matter particle and a vector mediator. Imposing gauge invariance then leads to strong constraints from dilepton resonance searches and electroweak precision tests. Furthermore, the new states required to restore perturbative unitarity can mix with Standard Model states and mediate interactions between the dark and the visible sector, leading to new experimental signatures such as invisible Higgs decays. The resulting constraints are typically stronger than the 'classic' constraints on DM simplified models such as monojet searches and make it difficult to avoid thermal overproduction of dark matter.

Place, publisher, year, edition, pages
2016. no 2, 016
Keyword [en]
Beyond Standard Model, Cosmology of Theories beyond the SM
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-127349DOI: 10.1007/JHEP02(2016)016ISI: 000369424900002OAI: oai:DiVA.org:su-127349DiVA: diva2:911234
Available from: 2016-03-11 Created: 2016-03-02 Last updated: 2016-03-11Bibliographically approved

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Vogl, Stefan
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