A New Gauge Mediation Theory

TL;DR

This paper introduces a novel gauge mediation model of supersymmetry breaking with extended N=2 gauge sector, predicting unique collider signatures and a Standard Model-like Higgs, reducing fine-tuning issues.

Contribution

It presents a new gauge mediation framework inspired by brane constructions, featuring Dirac gaugino masses and distinctive experimental signatures.

Findings

Predicts a third chargino observable at colliders.

Higgs behaves exactly like the Standard Model Higgs.

Reduces fine-tuning in low tan(beta) scenarios.

Abstract

We propose a class of models with gauge mediation of supersymmetry breaking, inspired by simple brane constructions, where R-symmetry is very weakly broken. The gauge sector has an extended N=2 supersymmetry and the two electroweak Higgses form an N=2 hypermultiplet, while quarks and leptons remain in N=1 chiral multiplets. Supersymmetry is broken via the D-term expectation value of a secluded U(1) and it is transmitted to the Standard Model via gauge interactions of messengers in N=2 hypermultiplets: gauginos thus receive Dirac masses. The model has several distinct experimental signatures with respect to ordinary models of gauge or gravity mediation realizations of the Minimal Supersymmetric Standard Model (MSSM). First, it predicts extra states as a third chargino that can be observed at collider experiments. Second, the absence of a D-flat direction in the Higgs sector implies a lightest Higgs behaving exactly as the Standard Model one and thus a reduction of the `little' fine-tuning in the low tan(beta) region. This breaking of supersymmetry can be easily implemented in string theory models