The Gaugino Code

TL;DR

This work shows that gaugino mass ratios at the TeV scale, $M_a/g_a^2$, are powerful probes of SUSY-breaking mediation and can reveal the underlying mechanism with relatively little UV-model dependence. By deriving a general 4D effective SUGRA expression and decomposing low-energy gaugino masses into tree-level, anomaly, gauge-threshold, and string-threshold contributions, the authors identify three robust patterns: mSUGRA, anomaly, and mirage, which arise across diverse UV completions. They map these patterns to concrete schemes (e.g., KKLT, large volume IIB, heterotic, M-theory) and discuss how LHC observables, including mass ratios and sum rules, can distinguish between them, while noting that UV-sensitive scenarios may obscure predictivity. The findings provide a practical framework for early SUSY discrimination at colliders and emphasize gaugino masses as a first, model-independent handle on the nature of SUSY breaking.

Abstract

Gauginos might play a crucial role in the search for supersymmetry at the Large Hadron Collider (LHC). Mass predictions for gauginos are rather robust and often related to the values of the gauge couplings. We analyse the ratios of gaugino masses in the LHC energy range for various schemes of supersymmetry breakdown and mediation. Three distinct mass patterns emerge.