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Simplified dark matter models with two Higgs doublets : I. pseudoscalar mediators.

Bauer, Martin and Haisch, Ulrich and Kahlhoefer, Felix (2017) 'Simplified dark matter models with two Higgs doublets : I. pseudoscalar mediators.', Journal of high energy physics., 2017 (05). p. 138.


We study a new class of renormalisable simplified models for dark matter searches at the LHC that are based on two Higgs doublet models with an additional pseudoscalar mediator. In contrast to the spin-0 simplified models employed in analyses of Run I data these models are self-consistent, unitary and bounds from Higgs physics typically pose no constraints. Predictions for various missing transverse energy (E T,miss) searches are discussed and the reach of the 13 TeV LHC is explored. It is found that the proposed models provide a rich spectrum of complementary observables that lead to non-trivial constraints. We emphasise in this context the sensitivity of the tt¯+ET,miss, mono-Z and mono-Higgs channels, which yield stronger limits than mono-jet searches in large parts of the parameter space. Constraints from spin-0 resonance searches, electroweak precision measurements and flavour observables are also derived and shown to provide further important handles to constraint and to test the considered dark matter models.

Item Type:Article
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Publisher statement:This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Date accepted:14 May 2017
Date deposited:05 March 2020
Date of first online publication:25 May 2017
Date first made open access:05 March 2020

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