Global fits of simplified models for dark matter with GAMBIT

Global fits explore different parameter regions of a given model and apply constraints obtained at many energy scales. This makes it challenging to perform global fits of simplified models, which may not be valid at high energies. In this study, we derive a unitarity bound for a simplified vector da...

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Published inThe European physical journal. C, Particles and fields Vol. 83; no. 8; pp. 692 - 13
Main Authors Chang, Christopher, Scott, Pat, Gonzalo, Tomás E, Kahlhoefer, Felix, White, Martin
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 01.08.2023
Springer Nature B.V
SpringerOpen
Subjects
Candidates
Constraint modelling
Dark matter
Energy
Parameters
Particle physics
Quarks
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Summary:Global fits explore different parameter regions of a given model and apply constraints obtained at many energy scales. This makes it challenging to perform global fits of simplified models, which may not be valid at high energies. In this study, we derive a unitarity bound for a simplified vector dark matter model with an s-channel vector mediator and apply it to global fits of this model with GAMBIT in order to correctly interpret missing energy searches at the LHC. Two parameter space regions emerge as consistent with all experimental constraints, corresponding to different annihilation modes of the dark matter. We show that although these models are subject to strong validity constraints, they are currently most strongly constrained by measurements less sensitive to the high-energy behaviour of the theory. Understanding when these models cannot be consistently studied will become increasingly relevant as they are applied to LHC Run 3 data.
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ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-023-11859-3