Eur. Phys. J. C (2021) 81: 466
https://doi.org/10.1140/epjc/s10052-021-09218-1

Regular Article - Theoretical Physics

Heavy $Z^{\prime }$ bosons in the secluded $U{(1)}^{\prime }$ model at hadron colliders

¹ Department of Physics, Concordia University, 7141 Sherbrooke St. West, H4B 1R6, Montreal, QC, Canada
² Department of Engineering Physics, Ankara University, 06100, Ankara, Turkey
³ Department of Physics, Middle East Technical University, 06800, Ankara, Turkey

^a mariana.frank@concordia.ca

Received: 1 October 2020
Accepted: 10 May 2021
Published online: 27 May 2021

Abstract

We study $Z^{\prime }$ phenomenology at hadron colliders in an $U{(1)}^{\prime }$ extended MSSM. We choose a $U{(1)}^{\prime }$ model with a secluded sector, where the tension between the electroweak scale and developing a large enough mass for $Z^{\prime }$ is resolved by incorporating three additional singlet superfields into the model. We perform a detailed analysis of the production, followed by decays, including into supersymmetric particles, of a $Z^{\prime }$ boson with mass between 4 and 5.2 TeV, with particular emphasis on its possible discovery. We select three different scenarios consistent with the latest available experimental data and relic density constraints, and concentrate on final signals with $2\ell +⧸E_T$, $4\ell +⧸E_T$ and $6\ell +⧸E_T$. Including the SM background from processes with two, three or four vector bosons, we show the likelihood of observing a $Z^{\prime }$ boson is not promising for the HL-LHC at 14 TeV. While at 27 and 100 TeV, the situation is more optimistic, and we devise specific benchmark scenarios which could be observed.