Low-scale gaugino mediation, lots of leptons at the LHC

TL;DR

This paper explores a low-scale gaugino mediation model predicting heavy gauginos and light sleptons, leading to distinctive multi-lepton signatures at the LHC, with specific mass spectra and decay patterns analyzed.

Contribution

It introduces a low-scale deconstructed gaugino mediation model with a detailed spectrum calculation and implications for LHC phenomenology.

Findings

Gauginos are significantly heavier than scalar superpartners.

Squark decay chains produce multiple leptons at the LHC.

Left-handed staus have large branching fractions into right-handed staus and the Higgs.

Abstract

Low-scale gaugino mediation predicts that gauginos are significantly heavier than scalar superpartners. In order of increasing mass the lightest superpartners are the gravitino, right-handed sleptons and left-handed sleptons (no light neutralino!). This implies that squark decay chains pass through one or more sleptons and typical final states from squark and gluino production at the LHC include multiple leptons. In addition, left-handed staus have large branching fractions into right-handed staus and the Higgs. As an example, we compute the spectrum of low-scale deconstructed gaugino mediation. In this model gauginos acquire masses at tree level at 5 TeV while scalar masses are generated radiatively from the gaugino masses.