Gauge coupling unification with large extra dimensions

TL;DR

This paper explores gauge coupling unification in the MSSM with large extra dimensions, identifying scenarios where unification occurs at accessible energy scales without enlarging the gauge group.

Contribution

It demonstrates that gauge coupling unification can be achieved with TeV-scale extra dimensions and supersymmetry breaking, within the MSSM framework, without additional gauge groups or particles.

Findings

Unification can occur with the strong coupling constant within experimental bounds.

Both the compactification and SUSY breaking scales can be in the few TeV range.

Two-scale unification scenarios are compatible with LHC energy ranges.

Abstract

We make a detailed study of the unification of gauge couplings in the MSSM with large extra dimensions. We find some scenarios where unification can be achieved (with the strong coupling constant at the Z mass within one standard deviation of the experimental value) with both the compactification scale and the SUSY breaking scale in the few TeV range. No enlargement of the gauge group or particle content is needed. One particularly interesting scenario is when the SUSY breaking scale is larger than the compactification scale, but both are small enough to be probed at the CERN LHC. Unification in two scales scenarios is also investigated and found to give results within the LHC.