Non-universal gaugino masses: a signal-based analysis for the Large Hadron Collider

TL;DR

This paper analyzes LHC signals for supersymmetric models with non-universal gaugino masses, using multichannel event rate ratios to distinguish different GUT breaking schemes and identify unique signatures.

Contribution

It provides a comprehensive multichannel analysis of non-universal gaugino mass scenarios at the LHC, including numerical predictions and event ratios for various GUT models.

Findings

Certain event ratios can distinguish GUT breaking schemes from universal gaugino mass models.

Predicted event rates vary significantly across different non-universal scenarios.

Specific regions in parameter space show promising signals with manageable backgrounds.

Abstract

We discuss the signals at the Large Hadron Collider (LHC) for scenarios with non-universal gaugino masses in supersymmetric (SUSY) theories. We perform a multichannel analysis, and consider the ratios of event rates in different channels such as $jets + {E}_T/ $, $same$ - and $opposite$-$sign dileptons$ $+jets+ {E}_T/ $, as well as $single-lepton$ and $trilepton$ final states together with $jets + {E}_T/ $ . Low-energy SUSY spectra corresponding to high-scale gaugino non-universality arising from different breaking schemes of SU(5) as well as SO(10) Grand Unified (GUT) SUSY models are considered, with both degenerate low-energy sfermion masses and those arising from a supergravity scenario. We present the numerical predictions over a wide range of the parameter space using the event generator {\tt Pythia}, specifying the event selection criteria and pointing out regions where signals are likely to be beset with backgrounds. Certain broad features emerge from the study, which may be useful in identifying the signatures of different GUT breaking schemes and distinguishing them from a situation with a universal gaugino mass at high scale. The absolute values of the predicted event rates for different scenarios are presented together with the various event ratios, so that these can also be used whenever necessary.