Minimal models for $g-2$ and dark matter confront asymptotic safety

TL;DR

This paper explores how asymptotic safety constrains simple extensions of the Standard Model to simultaneously explain the muon g-2 anomaly and dark matter, deriving unique predictions and testing them against collider and cosmological data.

Contribution

It introduces asymptotic safety as a framework to constrain new physics models addressing muon g-2 and dark matter, providing specific phenomenological predictions.

Findings

Models are constrained by collider and dark matter data.

Unique predictions arise from UV fixed point boundary conditions.

Parameter space is significantly restricted by experimental bounds.

Abstract

We use the framework of asymptotic safety above the Planck scale to constrain the parameter space of simple models of new physics that can accommodate the measured value of the anomalous magnetic moment of the muon and the relic density of dark matter. We couple parametrically to the trans-Planckian quantum physics a set of SU(2)$\times$U(1) invariant extensions of the Standard Model, each comprising an inert scalar field and one pair of colorless fermions that communicate to the muons through Yukawa-type interactions. The presence of an interactive UV fixed point in the system of gauge and Yukawa couplings imposes a set of boundary conditions at the Planck scale, which allow one to derive unique phenomenological predictions in each case and distinguish the different representations of the gauge group from one another. We apply to the models constraints from the $h\to \mu\mu$ signal strength at ATLAS and CMS, direct LHC searches for electroweak production with leptons and missing energy in the final state, and the dark matter relic density. We find that they further restrict the available parameter space.