Phenomenological consequences of supersymmetry with anomaly-induced masses

TL;DR

This paper explores the phenomenology of supersymmetry models where anomaly-induced contributions dominate the soft mass spectrum, highlighting distinctive collider signatures and cosmological implications.

Contribution

It provides a detailed analysis of anomaly-induced supersymmetry breaking, including electroweak symmetry breaking, scalar masses, and gaugino mass relations, with novel collider and cosmological insights.

Findings

Gaugino masses proportional to gauge beta-functions

Potential for Wino as the lightest supersymmetric particle

Mass degeneracy of sleptons and a very massive gravitino

Abstract

In the supersymmetric standard model there exist pure gravity contributions to the soft mass parameters which arise via the superconformal anomaly. We consider the low-energy phenomenology with a mass spectrum dominated by the anomaly-induced contributions. In a well-defined minimal model we calculate electroweak symmetry breaking parameters, scalar masses, and the full one-loop splitting of the degenerate Wino states. The most distinctive features are gaugino masses proportional to the corresponding gauge coupling beta-functions, the possibility of a Wino as the lightest supersymmetric particle, mass degeneracy of sleptons, and a very massive gravitino. Unique signatures at high-energy colliders include dilepton and single lepton final states, accompanied by missing energy and displaced vertices. We also point out that this scenario has the cosmological advantage of ameliorating the gravitino problem. Finally, the primordial gravitino decay can produce a relic density of Wino particles close to the critical value.