Journal article

Self-consistent Dark Matter simplified models with an s-channel scalar mediator

Nicole F Bell, Giorgio Busoni, Isaac W Sanderson

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | IOP PUBLISHING LTD | Published : 2017

Abstract

We examine Simplified Models in which fermionic DM interacts with Standard Model (SM) fermions via the exchange of an s-channel scalar mediator. The single-mediator version of this model is not gauge invariant, and instead we must consider models with two scalar mediators which mix and interfere. The minimal gauge invariant scenario involves the mixing of a new singlet scalar with the Standard Model Higgs boson, and is tightly constrained. We construct two Higgs doublet model (2HDM) extensions of this scenario, where the singlet mixes with the 2nd Higgs doublet. Compared with the one doublet model, this provides greater freedom for the masses and mixing angle of the scalar mediators, and the..

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University of Melbourne Researchers

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Funding Acknowledgements

This work was supported in part by the Australian Research Council. We thank Yi Cai, Matthew Dolan, Francesco D'Eramo and Gino Isidori for helpful discussions, and Ulrich Haisch for detailed comments on an earlier draft of the manuscript. Feynman diagrams were drawn using TIKZ-FEYNMAN [84].