Towards a Higgs mass determination in asymptotically safe gravity with a dark portal

TL;DR

This paper explores how an asymptotically safe gravity framework with a dark portal can influence the Higgs mass prediction, incorporating dark sector effects and quantum gravity considerations.

Contribution

It introduces a toy model extending the Standard Model with quantum gravity and a dark sector, analyzing how dark fields affect the Higgs mass prediction.

Findings

Dark sector can lower the Higgs mass prediction through mixing effects.

Spontaneous symmetry breaking in the dark sector influences Higgs mass.

The model provides a parameter-dependent Higgs mass estimate.

Abstract

There are indications that an asymptotically safe UV completion of the Standard Model with gravity could constrain the Higgs self-coupling, resulting in a prediction of the Higgs mass close to the vacuum stability bound in the Standard Model. The predicted value depends on the top quark mass and comes out somewhat higher than the experimental value if the current central value for the top quark mass is assumed. Beyond the Standard Model, the predicted value also depends on dark fields coupled through a Higgs portal. Here we study the Higgs self-coupling in a toy model of the Standard Model with quantum gravity that we extend by a dark scalar and fermion. Within the approximations used in arXiv:2005.03661 , there is a single free parameter in the asymptotically safe dark sector, as a function of which the predicted (toy model) Higgs mass can be lowered due to mixing effects if the dark sector undergoes spontaneous symmetry breaking.