# Discovering heavy U(1)-gauged Higgs bosons at the HL-LHC

## TL;DR

This paper assesses the Large Hadron Collider's ability to discover a heavy scalar Higgs boson in a $U(1)_{B-L}$ extended Standard Model, showing potential detection at 13 TeV with sufficient luminosity.

## Contribution

It provides the first detailed analysis of the discovery prospects for a heavy $U(1)_{B-L}$-gauged Higgs boson in the dilepton channel at the LHC.

## Key findings

- Heavy scalar can be discovered with 5σ significance at 13 TeV LHC.
- Discovery is feasible with 300 to 1400 fb$^{-1}$ of data.
- Mass range for discovery is between 500 GeV and 1 TeV.

## Abstract

We determine the discovery potential of the Large Hadron Collider (LHC) at 13 TeV center-of-mass energy for a heavy scalar resonance in the dilepton channel. In particular, we consider the singlet-like heavy mass eigenstate of a mixed two Higgs doublet and scalar singlet model in the $U(1)_{B-L}$ extension of the Standard Model. We find that, despite the small coupling of the singlet scalar with the doublets, this heavy scalar can be discovered with 5$\sigma$ at the LHC with integrated luminosities of $\sim 300$ to $1400$ fb$^{-1}$ in the mass range between 500 GeV and 1 TeV.