Unitarisation of EFT Amplitudes for Dark Matter Searches at the LHC

Abstract

We propose a new approach to the LHC dark matter search analysis within the effective field theory (EFT) framework by utilising the K-matrix unitarisation formalism. This approach provides a reasonable estimate of the dark matter production cross section at high energies, and hence allows reliable bounds to be placed on the cut-off scale of relevant operators without running into the problem of perturbative unitarity violation. We exemplify this procedure for the effective operator D5 in monojet dark matter searches in the collinear approximation. We compare our bounds to those obtained using the truncation method and identify a parameter region where the unitarisation prescription leads to more stringent bounds.

20 pages, 7 figures. References added and minor corrections made to match published version

References in corpus (5)

• Search for New Phenomena in Dijet Mass and Angular Distributions from $pp$ Collisions at $\sqrt{s}$ = 13 TeV with the ATLAS Detector
• On the Validity of the Effective Field Theory for Dark Matter Searches at the LHC Part III: Analysis for the $t$-channel
• Mono-W Dark Matter Signals at the LHC: Simplified Model Analysis
• Dark Forces in the Sky: Signals from Z' and the Dark Higgs
• On Mono-W Signatures in Spin-1 Simplified Models

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• Self-consistent Dark Matter Simplified Models with an s-channel scalar mediator
• Loop Effects in Direct Detection
• The Pursuit of Dark Matter at Colliders - An Overview
• GAMBIT and its Application in the Search for Physics Beyond the Standard Model
• The Last Gasp of Dark Matter Effective Theory
• Multi-Higgs-Doublet Models and Singular Alignment
• Unitarity Bounds on Effective Field Theories at the LHC
• Effective Theory for Electroweak Doublet Dark Matter
• Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories