Gluino LOSP with Axino LSP

TL;DR

This paper introduces a new scenario with long-lived gluinos as the LOSP and axino as the LSP, reducing mass bounds and suggesting detection strategies in collider experiments.

Contribution

It presents a novel supersymmetric model with gluino LOSP and axino LSP, detailing parameter space and experimental implications.

Findings

Gluino mass bounds are lowered to below 1000 GeV for certain axion decay constants.

Detection strategies include searching for decaying R-hadrons in detectors.

Gluino LOSP models are viable in mirage-mediation and gauge-mediated SUSY breaking scenarios.

Abstract

In this letter we have presented a novel version of "long-lived" gluinos in supersymmetric models with the gluino the lightest ordinary supersymmetric particle [LOSP] and axino LSP. Within certain ranges of the axion decay constant $f_a < 1 \times 10^{10}$ GeV, the gluino mass bounds are reduced to less than 1000 GeV. The best limits can be obtained by looking for decaying R-hadrons in the detector where the gluino decays to a gluon and axino in the calorimeters. SUSY models with a gluino LOSP can occur over a significant region of parameter space in either {\em mirage-mediation} or general gauge-mediated SUSY breaking models. The gluino LOSP is not constrained by cosmology, but in this scenario the axion/axino may be good dark matter candidates.