The Reach of Fermilab Tevatron Upgrades for SU(5) Supergravity Models with Non-universal Gaugino Masses

TL;DR

This paper analyzes how upgrades to the Fermilab Tevatron collider could detect supersymmetry in SU(5) supergravity models with non-universal gaugino masses, highlighting different experimental signatures depending on the model.

Contribution

It investigates the collider reach for non-universal gaugino mass models, revealing distinct experimental signatures and sensitivities compared to minimal supergravity models.

Findings

The 24 model produces many isolated leptons and Z boson signals.

The 75 and 200 models have reduced leptonic signals, mainly detectable via missing energy plus jets.

Tevatron upgrades could potentially observe SUSY signals in specific non-universal gaugino mass scenarios.

Abstract

We explore the reach of luminosity upgrades of the Fermilab Tevatron collider for SU(5) supergravity models in which non-universal GUT-scale gaugino masses arise via a vacuum expectation value for the auxiliary component of a superfield that transforms as a 24, 75 or 200 dimensional representation of SU(5). This results in a different pattern of sparticle masses and mixing angles from what is expected in the minimal supergravity model (mSUGRA) with universal GUT scale gaugino masses. We find that the resulting signal cross sections, and hence the reach of the Tevatron, are sensitive to the gaugino masses at the GUT scale. In the 24 model, the large splitting amongst the two lightest neutralinos leads to SUSY events containing many isolated leptons, including events with a real leptonic Z boson plus jets plus missing energy signal which is visible over much of parameter space. In contrast, in the 75 and 200 models, the reach via leptonic SUSY signals is greatly reduced relative to mSUGRA, and the signal is usually visible only via the canonical $\eslt +$jets channel.