A revisit to a compressed supersymmetric spectrum with 125 GeV Higgs

TL;DR

This paper thoroughly analyzes highly compressed supersymmetric spectra at 13 TeV LHC, finding that multi-jet plus missing energy signals are more effective for discovery than mono-jet channels, considering Higgs and dark matter constraints.

Contribution

It provides an exhaustive simulation-based study of highly compressed SUSY spectra at 13 TeV LHC, highlighting the most promising detection channels.

Findings

Multi-jet + missing energy is more effective for SUSY detection.

Mono-jet + missing energy serves as a confirmatory channel.

Compressed spectra remain challenging but detectable with optimized strategies.

Abstract

A compressed spectrum was initially proposed as an explanation for the elusiveness of low-energy supersymmetry (SUSY). Some characteristic signals at the Large Hadron Collider (LHC), such as mono-jet + \slashed{E}_T, had been propounded as its trademark signals. However, later investigations suggested that lower limits on the supersymmetric particle masses would be quite stringent in spite of compression. Also, most compressed SUSY scenarios studied so far are only partially compressed. In this backdrop, we make an exhaustive analysis of the compressed SUSY scenarios for the 13 TeV run of LHC, keeping the level of compression in the entire spectrum as high as possible. A broad class of benchmark spectra are thus considered, after ensuring consistency with the observed Higgs mass as well as the dark matter constraints. The rates of observable events in the high-energy run are obtained through detailed simulation, for both the multi-jet +\slashed{E}_T and mono-jet + \slashed{E}_T final states. Our conclusion is that the former is still more efficient to reveal a compressed SUSY spectrum first, while the latter can serve as a useful confirmatory channel.