Loopholes in $Z^\prime$ searches at the LHC: exploring supersymmetric and leptophobic scenarios

TL;DR

This paper investigates potential gaps in current LHC searches for $Z^\u200bprime$ bosons by exploring supersymmetric and leptophobic models, revealing scenarios where these particles evade existing bounds and suggesting expanded search strategies.

Contribution

It introduces specific supersymmetric and leptophobic $Z^\u200bprime$ models that can bypass current experimental limits, proposing new search avenues at the LHC.

Findings

Certain $Z^\u200bprime$ models evade standard bounds

Supersymmetric $Z^\u200bprime$ decays produce distinctive dilepton signals

Future LHC data could observe these signals with high significance

Abstract

Searching for heavy vector bosons $Z^\prime$, predicted in models inspired by Grand Unification Theories, is among the challenging objectives of the LHC. The ATLAS and CMS collaborations have looked for $Z^\prime$ bosons assuming that they can decay only into Standard Model channels, and have set exclusion limits by investigating dilepton, dijet and to a smaller extent top-antitop final states. In this work we explore possible loopholes in these $Z^\prime$ searches by studying supersymmetric as well as leptophobic scenarios. We demonstrate the existence of realizations in which the $Z^\prime$ boson automatically evades the typical bounds derived from the analyses of the Drell-Yan invariant-mass spectrum. Dileptonic final states can in contrast only originate from supersymmetric $Z^\prime$ decays and are thus accompanied by additional effects. This feature is analyzed in the context of judiciously chosen benchmark configurations, for which visible signals could be expected in future LHC data with a $4\sigma-7\sigma$ significance. Our results should hence motivate an extension of the current $Z^\prime$ search program to account for supersymmetric and leptophobic models.