General Gauge Mediation with Gauge Messengers

TL;DR

This paper extends the General Gauge Mediation framework to include gauge messengers, revealing new effects on gaugino and sfermion masses, with implications for supersymmetry breaking models.

Contribution

It provides a model-independent, current-algebra based analysis of gauge messenger effects in gauge mediation, highlighting their impact on soft SUSY-breaking parameters.

Findings

Enhanced gaugino mass contributions from gauge messengers

Tachyonic sfermion masses generated at one loop

Significant one-loop A-terms at the messenger scale

Abstract

We generalize the General Gauge Mediation formalism to allow for the possibility of gauge messengers. Gauge messengers occur when charged matter fields of the susy-breaking sector have non-zero F-terms, which leads to tree-level, susy-breaking mass splittings in the gauge fields. A classic example is that SU(5) / SU(3) x SU(2) x U(1) gauge fields could be gauge messengers. We give a completely general, model independent, current-algebra based analysis of gauge messenger mediation of susy-breaking to the visible sector. Characteristic aspects of gauge messengers include enhanced contributions to gaugino masses, (tachyonic) sfermion mass-squareds generated already at one loop, and also at two loops, and significant one-loop A-terms, already at the messenger scale.