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Implications of unitarity and gauge invariance for simplified dark matter models

Kahlhoefer, F.; Schmidt-Hoberg, K.; Schwetz, T.; Vogl, S.

Abstract (englisch): 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.

Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1007/JHEP02(2016)016
ISSN: 1126-6708
URN: urn:nbn:de:swb:90-535188
KITopen ID: 1000053518
HGF-Programm 51.03.06; LK 01
Erschienen in Journal of High Energy Physics
Band 2016
Heft 2
Seiten 1-33
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagworte Beyond Standard Mode,l Cosmology of Theories beyond the SM
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