Multiboson signals in the UN2HDM

TL;DR

This paper explores multiboson signals from a heavy Z' resonance in the UN2HDM extension of the Standard Model, highlighting potential sizeable signals at the LHC that current searches may miss.

Contribution

It introduces the UN2HDM model with an extended scalar sector and analyzes its multiboson signals, proposing anomaly detection as a method to uncover these signals in LHC data.

Findings

Up to 4000 multiboson events predicted in benchmark scenarios.

Signals could be sizeable but are mostly uncovered by current searches.

Anomaly detection methods can potentially identify these signals.

Abstract

We address multiboson production from a heavy $Z'$ resonance in the context of the UN2HDM, a standard model extension with an additional $\text{U}(1)'$ symmetry and an enlarged scalar sector with an extra doublet and a singlet. After taking into account theoretical and experimental constraints on the model, it turns out this type of signals - mostly uncovered by current searches - could be sizeable. We focus on three benchmark scenarios, each of them predicting up to 4000 multiboson events with the LHC Run 2 collected luminosity. Anomaly-detection methods could uncover those signals, if present in data.