Supernatural Supersymmetry: Phenomenological Implications of Anomaly-Mediated Supersymmetry Breaking

TL;DR

This paper explores the phenomenology of anomaly-mediated supersymmetry breaking models, highlighting their unique spectrum, collider signatures, and low-energy experimental implications, with a focus on the minimal model and its distinctive features.

Contribution

It provides a detailed analysis of the minimal anomaly-mediated supersymmetry breaking model, including its spectrum, collider prospects, and low-energy phenomenology, emphasizing the novel focus point behavior.

Findings

Squark and slepton masses can be much higher than naturalness bounds.

Wino, stau, and tau sneutrino are the potential LSP candidates.

Wino LSP scenario could be tested at the Tevatron Run II.

Abstract

We discuss the phenomenology of supersymmetric models in which supersymmetry breaking terms are induced by the super-Weyl anomaly. Such a scenario is envisioned to arise when supersymmetry breaking takes place in another world, i.e., on another brane. We review the anomaly-mediated framework and study in detail the minimal anomaly-mediated model parametrized by only 3+1 parameters: M_aux, m_0, \tan\beta, and sign(\mu). The renormalization group equations exhibit a novel "focus point" (as opposed to fixed point) behavior, which allows squark and slepton masses to be far above their usual naturalness bounds. We present the superparticle spectrum and highlight several implications for high energy colliders. Three lightest supersymmetric particle (LSP) candidates exist: the Wino, the stau, and the tau sneutrino. For the Wino LSP scenario, light Wino triplets with the smallest possible mass splittings are preferred; such Winos are within reach of Run II Tevatron searches. Finally, we study a variety of sensitive low energy probes, including b -> s gamma, the anomalous magnetic moment of the muon, and the electric dipole moments of the electron and neutron.