# Cornering Compressed Gluino at the LHC

## TL;DR

This paper explores innovative collider search strategies for highly degenerate gluinos and neutralinos at the LHC, focusing on long-lived gluinos and their detection via displaced vertices, disappearing tracks, and large energy deposit signatures.

## Contribution

It proposes combined search methods for compressed gluino scenarios using displaced vertices, disappearing tracks, and large energy deposit signatures at the LHC.

## Key findings

- Displaced vertex searches can detect gluinos with decay lengths of detector-scale.
- Disappearing track searches are effective for certain gluino-neutralino mass differences.
- Combined search strategies extend the reach for compressed gluino detection.

## Abstract

We discuss collider search strategies of gluinos which are highly degenerate with the lightest neutralino in mass. This scenario is fairly difficult to probe with conventional search strategies at colliders, and thus may provide a hideaway of supersymmetry. Moreover, such a high degeneracy plays an important role in dark matter physics as the relic abundance of the lightest neutralino is significantly reduced via coannihilation. In this paper, we discuss ways of uncovering this scenario with the help of longevity of gluinos; if the mass difference between the lightest neutralino and gluino is $\lesssim 100$ GeV and squarks are heavier than gluino, then the decay length of the gluino tends to be of the order of the detector-size scale. Such gluinos can be explored in the searches of displaced vertices, disappearing tracks, and anomalously large energy deposit by (meta)stable massive charged particles. We find that these searches are complementary to each other, and by combining their results we may probe a wide range of the compressed gluino region in the LHC experiments.