On Anomaly Mediated SUSY Breaking

TL;DR

This paper clarifies the correct calculation of AMSB gaugino masses, proposes replacing the traditional AMSB contribution to scalar masses with a Dine-Seiberg contribution, and discusses implications for supersymmetry breaking models.

Contribution

It corrects the AMSB gaugino mass calculation and introduces a new scalar mass contribution from Dine and Seiberg, differing from traditional AMSB predictions.

Findings

KL expression is the correct Wilsonian gaugino mass calculation.

Dine-Seiberg contribution can replace AMSB for scalar masses.

Dine-Seiberg contribution can produce positive slepton masses.

Abstract

A discrepancy between the Anomaly Mediated Supersymmetry Breaking (AMSB) gaugino mass calculated from the work of Kaplunovsky and Louis (hep-th/9402005) (KL) and other calculations in the literature is explained, and it is argued that the KL expression is the correct one relevant to the Wilsonian action. Furthermore it is argued that the AMSB contribution to the squark and slepton masses should be replaced by the contribution pointed out by Dine and Seiberg (DS) which has nothing to do with Weyl anomalies. This is not in general equivalent to the AMSB expression, and it is shown that there are models in which the usual AMSB expression would vanish but the DS one is non-zero. In fact the latter has aspects of both AMSB and gauge mediated SUSY breaking. In particular like the latter, it gives positive squared masses for sleptons.