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Report number	arXiv:1604.07975 ; DCPT-16-52 ; IPPP-16-26 ; CERN-TH-2016-094 ; DCPT-16-52 ; IPPP-16-26 ; CERN-TH-2016-094
Title	S-Channel Dark Matter Simplified Models and Unitarity
Related title	S-Channel Dark Matter Simplified Models and Unitarity
Author(s)	Englert, Christoph (Glasgow U. ; SUPA, UK) ; McCullough, Matthew (CERN) ; Spannowsky, Michael (Durham U., IPPP ; Durham U.)
Publication	2016-12
Imprint	27 Apr 2016
Number of pages	9
Note	Comments: 15 pages 15 pages
In:	Phys. Dark Universe 14 (2016) 48-56
DOI	10.1016/j.dark.2016.09.002
Subject category	Particle Physics - Phenomenology
Abstract	The ultraviolet structure of $s$-channel mediator dark matter simplified models at hadron colliders is considered. In terms of commonly studied $s$-channel mediator simplified models it is argued that at arbitrarily high energies the perturbative description of dark matter production in high energy scattering at hadron colliders will break down in a number of cases. This is analogous to the well documented breakdown of an EFT description of dark matter collider production. With this in mind, to diagnose whether or not the use of simplified models at the LHC is valid, perturbative unitarity of the scattering amplitude in the processes relevant to LHC dark matter searches is studied. The results are as one would expect: at the LHC and future proton colliders the simplified model descriptions of dark matter production are in general valid. As a result of the general discussion, a simple new class of previously unconsidered `Fermiophobic Scalar' simplified models is proposed, in which a scalar mediator couples to electroweak vector bosons. The Fermiophobic simplified model is well motivated and exhibits interesting collider and direct detection phenomenology.
Copyright/License	arXiv nonexclusive-distrib. 1.0 Preprint: © 2016-2024 CERN (License: CC-BY-4.0)

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