An analysis of a Heavy Gluino LSP at CDF : The Heavy Gluino Window

TL;DR

This paper investigates the mass limits of a heavy gluino as the lightest supersymmetric particle using Tevatron data, identifying an allowed mass window between 25 and 35 GeV and analyzing the impact of R-hadron interactions.

Contribution

It provides a detailed analysis of gluino mass constraints from Tevatron Run I data, considering R-hadron signatures and their dependence on interaction models, extending previous LEP results.

Findings

Gluinos with mass between 35 and 115 GeV are excluded by CDF data.

An allowed gluino mass window exists between 25 and 35 GeV.

The exclusion limits depend on R-hadron charge and calorimeter energy loss models.

Abstract

In this paper we consider a heavy gluino to be the lightest supersymmetric particle [LSP]. We investigate the limits on the mass of a heavy gluino LSP, using the searches for excess events in the jets plus missing momentum channel in Run I. The neutral and charged R-hadrons, containing a heavy gluino LSP, have distinct signatures at the Fermilab Tevatron. The range of excluded gluino masses depends on whether the R-hadron is charged or neutral and the amount of energy deposited in the hadronic calorimeter. The latter depends on the energy loss per collision in the calorimeter and the number of collisions; where both quantities require a model for R-hadron- Nucleon scattering. We show how the excluded range of gluino mass depends on these parameters. We find that gluinos with mass in the range between $\sim 35$ GeV and $\sim 115$ GeV are excluded by CDF Run I data. Combined with previous results of Baer et al., which use LEP data to exclude the range 3 - 22$\sim$25 GeV, our result demonstrates that an allowed window for a heavy gluino with mass between 25 and 35 GeV is quite robust. Finally we discuss the relevant differences of our analysis of Tevatron data to that of Baer et al.