Large trilinear $A_t$ soft supersymmetry breaking coupling from 5D MSSM

TL;DR

This paper explores how a five-dimensional MSSM framework can naturally generate a large trilinear coupling $A_t$, enabling the Higgs mass to be achieved with a light stop, thus addressing fine-tuning issues.

Contribution

It demonstrates that power law running in 5D MSSM can produce a large $A_t$ at low energies, linking high-scale parameters to observable superpartner masses.

Findings

Large $A_t$ can be generated via 5D RG evolution.

Light stop masses below 1 TeV are achievable.

Higgs mass can be reproduced with this setup.

Abstract

The possibility of generating a large trilinear $A_t$ soft supersymmetry breaking coupling at low energies through renormalisation group evolution in the 5D MSSM is investigated. Using the power law running in five dimensions and a compactification scale in the 10-$10^3$ TeV range, to show that gluino mass may drive a large enough $A_t$ to reproduce the measured Higgs mass and have a light stop superpartner below $\sim 1$ TeV as preferred by the fine tuning argument for the Higgs mass.