When Anomaly Mediation is UV Sensitive

TL;DR

This paper explores alternative deflection models in anomaly mediated supersymmetry breaking, showing that higher thresholds can expand the model space and potentially address issues like tachyonic sleptons.

Contribution

It introduces a new class of deflection models with heavy thresholds, extending the framework of extended anomaly mediation and broadening the scope of possible solutions.

Findings

High deflection thresholds are achievable with heavy singlets.

The model space for anomaly mediation deflections is larger than previously recognized.

Potential for resolving tachyonic slepton issues with new deflection mechanisms.

Abstract

Despite its successes---such as solving the supersymmetric flavor problem---anomaly mediated supersymmetry breaking is untenable because of its prediction of tachyonic sleptons. An appealing solution to this problem was proposed by Pomarol and Rattazzi where a threshold controlled by a light field deflects the anomaly mediated supersymmetry breaking trajectory, thus evading tachyonic sleptons. In this paper we examine an alternate class of deflection models where the non-supersymmetric threshold is accompanied by a heavy, instead of light, singlet. The low energy form of this model is the so-called extended anomaly mediation proposed by Nelson and Weiner, but with potential for a much higher deflection threshold. The existence of this high deflection threshold implies that the space of anomaly mediated supersymmetry breaking deflecting models is larger than previously thought.