Global fits of simplified models for dark matter with GAMBIT

Christopher Chang; Pat Scott; Tomás E. Gonzalo; Felix Kahlhoefer; Anders Kvellestad; Martin White

doi:10.1140/epjc/s10052-023-11399-w

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 249
https://doi.org/10.1140/epjc/s10052-023-11399-w

Regular Article - Theoretical Physics

I. Scalar and fermionic models with s-channel vector mediators

Christopher Chang¹^a, Pat Scott², Tomás E. Gonzalo³^,4, Felix Kahlhoefer³^,4, Anders Kvellestad⁵ and Martin White⁶

¹ School of Mathematics and Physics, The University of Queensland, St. Lucia, 4072, Brisbane, QLD, Australia
² Quantum Brilliance Pty Ltd, The Australian National University, Daley Road, 2601, Acton, ACT, Australia
³ Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, 52056, Aachen, Germany
⁴ Institute for Theoretical Particle Physics (TTP), Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany
⁵ Department of Physics, University of Oslo, 0316, Oslo, Norway
⁶ ARC Centre of Excellence for Dark Matter Particle Physics and CSSM, Department of Physics, University of Adelaide, 5005, Adelaide, SA, Australia

^a christopher.chang@uq.net.au

Received: 12 October 2022
Accepted: 12 March 2023
Published online: 24 March 2023

Abstract

Simplified models provide a useful way to study the impacts of a small number of new particles on experimental observables and the interplay of those observables, without the need to construct an underlying theory. In this study, we perform global fits of simplified dark matter models with GAMBIT using an up-to-date set of likelihoods for indirect detection, direct detection and collider searches. We investigate models in which a scalar or fermionic dark matter candidate couples to quarks via an s-channel vector mediator. Large parts of parameter space survive for each model. In the case of Dirac or Majorana fermion dark matter, excesses in LHC monojet searches and relic density limits tend to prefer the resonance region, where the dark matter has approximately half the mass of the mediator. A combination of vector and axial-vector couplings to the Dirac candidate also leads to competing constraints from direct detection and unitarity violation.

© The Author(s) 2023

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