Phenomenology of a String-Inspired Supersymmetric Model with Inverted Scalar Mass Hierarchy

TL;DR

This paper explores a string-inspired supersymmetric model featuring an inverted scalar mass hierarchy, analyzing its phenomenology and comparing it with minimal supergravity models, highlighting differences in collider signatures and dark matter predictions.

Contribution

It introduces and studies a string-inspired SUSY model with heavy first-two-generation sfermions and lighter third-generation sfermions, contrasting it with mSUGRA.

Findings

Distinctive SUSY trilepton signatures at Tevatron.

Different $b\to s\gamma$ branching ratios.

Altered neutralino dark matter relic density.

Abstract

Supersymmetric (SUSY) models with heavy sfermions ($m_{\tilde{f}} \sim 10$ TeV) in the first two generations and the third generation sfermion masses below 1 TeV can solve the SUSY flavor and the CP problems as well as satisfy naturalness constraints. We study the phenomenology of a string-inspired scenario and compare it with the minimal supergravity unified model (mSUGRA). The SUSY trilepton signature at the upgraded Tevatron, the $b\to s\gamma$ branching fraction and the neutralino dark matter relic density in this model can differ significantly from the mSUGRA model.