Flavorful hybrid anomaly-gravity mediation

TL;DR

This paper proposes a hybrid supersymmetry breaking model combining anomaly and gravity mediation in a five-dimensional framework, addressing flavor issues and predicting distinctive collider signatures and rare decay rates.

Contribution

It introduces a hybrid anomaly-gravity mediation model that preserves anomaly gaugino patterns, solves the flavor problem via alignment, and predicts observable collider and decay signatures.

Findings

Flavor-tachyon link realized with Abelian symmetries

Predicted O(1) slepton mass splittings

Enhanced collider and rare decay signatures

Abstract

We consider supersymmetric models where anomaly and gravity mediation give comparable contributions to the soft terms and discuss how this can be realized in a five-dimensional brane world. The gaugino mass pattern of anomaly mediation is preserved in such a hybrid setup. The flavorful gravity-mediated contribution cures the tachyonic slepton problem of anomaly mediation. The supersymmetric flavor puzzle is solved by alignment. We explicitly show how a working flavor-tachyon link can be realized with Abelian flavor symmetries and give the characteristic signatures of the framework, including O(1) slepton mass splittings between different generations and between doublets and singlets. This provides opportunities for same flavor dilepton edge measurements with missing energy at the Large Hadron Collider (LHC). Rare lepton decay rates could be close to their current experimental limit. Compared to pure gravity mediation, the hybrid model is advantageous because it features a heavy gravitino which can avoid the cosmological gravitino problem of gravity-mediated models combined with leptogenesis.