Evidence of the true Higgs boson $H_T$ at the LHC Run 2

TL;DR

This paper presents evidence from LHC Run 2 data supporting the existence of a broad heavy Higgs boson around 700 GeV, consistent with a previous theoretical proposal of a true Higgs boson $H_T$ with mass near 750 GeV.

Contribution

The study provides the first experimental indication of a broad heavy Higgs resonance at 700 GeV, aligning with prior theoretical predictions of the true Higgs boson $H_T$.

Findings

Observation of a broad resonance around 700 GeV in the $ZZ$ decay channel.

Combined data from ATLAS and CMS show over five sigma significance.

Experimental results are in fair agreement with the theoretical model.

Abstract

The aim of the present note is to compare the recent LHC data at $\sqrt{s} =13 \,TeV$ with our previous theoretical proposal that the true Higgs boson $H_T$ should be a broad heavy resonance with mass around $750 \, GeV$. We focus on the so-called golden channel $H_T \rightarrow ZZ$ where the pair of Z bosons decay leptonically to $\ell^+ \ell^- \ell^+ \ell^-$, $\ell$ being either an electron or a muon. We use the data collected by the ATLAS and CMS Collaborations at $\sqrt{s} =13 \,TeV$ with an integrated luminosity of $36.1 \, fb^{-1}$ and $77.4 \, fb^{-1}$ respectively. We find that the experimental data from both the LHC Collaborations do display in the golden channel a rather broad resonance structure around $700 \, GeV$ with a sizeable statistical significance. Our theoretical expectations seem to be in fair good agreement with the experimental observations. Combining the data from both the ATLAS and CMS Collaborations we obtain an evidence of the heavy Higgs boson in this channel with an estimated statistical significance of more than five standard deviations.