The New Flavor of Higgsed Gauge Mediation

TL;DR

This paper introduces a new formalism for calculating soft masses in supersymmetric models with extended gauge symmetries, enabling more flexible and realistic model building, including novel flavor mediation mechanisms.

Contribution

It develops a general method for computing two-loop soft masses in gauge-mediated supersymmetry breaking with arbitrary symmetry breaking patterns, expanding the toolkit for SUSY model construction.

Findings

New formalism simplifies calculations for Higgsed gauge mediation.

Applications include GUT threshold corrections and non-decoupling D-terms.

Proposes a flavor mediation mechanism for natural SUSY spectra.

Abstract

Recent LHC bounds on squark masses combined with naturalness and flavor considerations motivate non-trivial sfermion mass spectra in the supersymmetric Standard Model. These can arise if supersymmetry breaking is communicated to the visible sector via new extended gauge symmetries. Such extended symmetries must be spontaneously broken, or confined, complicating the calculation of soft masses. We develop a new formalism for calculating perturbative gauge-mediated two-loop soft masses for gauge groups with arbitrary patterns of spontaneous symmetry breaking, simplifying the framework of "Higgsed gauge mediation." The resulting expressions can be applied to Abelian and non-Abelian gauge groups, opening new avenues for supersymmetric model building. We present a number of examples using our method, ranging from grand unified threshold corrections in standard gauge mediation to soft masses in gauge extensions of the Higgs sector that can raise the Higgs mass through non-decoupling D-terms. We also outline a new mediation mechanism called "flavor mediation", where supersymmetry breaking is communicated via a gauged subgroup of Standard Model flavor symmetries. Flavor mediation can automatically generate suppressed masses for third-generation squarks and implies a nearly exact U(2) symmetry in the first two generations, yielding a "natural SUSY" spectrum without imposing ad hoc global symmetries or giving preferential treatment to particular generations.