Retrofitted Natural Supersymmetry from a U(1)

TL;DR

This paper introduces a model where a broken U(1) gauge symmetry suppresses certain Yukawa couplings and influences SUSY breaking, leading to a natural SUSY spectrum compatible with current experimental constraints.

Contribution

It presents a novel mechanism using a U(1) symmetry to simultaneously address Yukawa hierarchies and SUSY breaking, resulting in a natural SUSY spectrum consistent with LHC data.

Findings

Heavy U(1) mediates dominant soft masses for first two generations

Gauge mediation provides suppressed soft terms for stops and others

Models evade current LHC limits and align with flavor constraints

Abstract

We propose that a single, spontaneously broken, U(1) gauge symmetry may be responsible for suppressing both the first two generation Yukawa couplings, and also, in a correlated manner, parameters in the dynamical supersymmetry (SUSY) breaking sector by the mechanism of retrofitting. In the dynamical SUSY breaking sector, these small parameters are typically required in order to introduce R-symmetry breaking in a controlled manner and obtain phenomenologically viable meta-stable vacua. The heavy U(1) multiplet mediates a dominant contribution to the first two generation MSSM sfermion soft masses, while gauge mediation provides a parametrically suppressed soft term contribution to the stop and most other states, so realising a natural SUSY spectrum in a fashion consistent with SUSY unification. In explicit models the spectra obtained can be such that current LHC limits are evaded, and predictions of flavour changing processes are consistent with observation. We examine both implementations with low scale mediation, and string-motivated examples where the U(1) is anomalous before the inclusion of a generalised Green-Schwarz mechanism.