Limit on the mass of a long-lived or stable gluino

TL;DR

This paper sets new lower mass limits on long-lived or stable gluinos by reinterpreting existing experimental data, considering various uncertainties, and providing the most stringent constraints for gluinos with lifetimes exceeding 30 ns.

Contribution

It provides the first comprehensive gluino mass limits considering uncertainties and squark mass variations, extending previous bounds for long-lived gluinos.

Findings

Gluino mass limit of 407 GeV for small squark-gluino mass splitting

Gluino mass limit of 397 GeV for heavy squarks

Lower limit of 322 GeV on gluino mass for arbitrary squark masses

Abstract

We reinterpret the generic CDF charged massive particle limit to obtain a limit on the mass of a stable or long-lived gluino. Various sources of uncertainty are examined. The $R$-hadron spectrum and scattering cross sections are modeled based on known low-energy hadron physics and the resultant uncertainties are quantified and found to be small compared to uncertainties from the scale dependence of the NLO pQCD production cross sections. The largest uncertainty in the limit comes from the unknown squark mass: when the squark -- gluino mass splitting is small, we obtain a gluino mass limit of 407 GeV, while in the limit of heavy squarks the gluino mass limit is 397 GeV. For arbitrary (degenerate) squark masses, we obtain a lower limit of 322 GeV on the gluino mass. These limits apply for any gluino lifetime longer than $\sim 30$ ns, and are the most stringent limits for such a long-lived or stable gluino.