On the new LHC resonance

TL;DR

This paper proposes that the 125 GeV resonance observed at the LHC might be a pseudoscalar meson within the Standard Model, and suggests the true Higgs boson could be a heavier 750 GeV resonance, aligning with recent experimental data.

Contribution

It introduces a novel interpretation of the 125 GeV resonance as a pseudoscalar meson and predicts a heavy Higgs at 750 GeV, providing a new perspective on LHC data analysis.

Findings

The 125 GeV resonance could be a pseudoscalar meson with specific quantum numbers.

A heavy Higgs boson at 750 GeV is proposed and its decay modes are analyzed.

Current experimental data at 13 TeV are compatible with the heavy Higgs hypothesis.

Abstract

We present an alternative interpretation within the Standard Model of the new LHC resonance at $125 \; GeV$. We further elaborate on our previous proposal that the resonance at 125 GeV could be interpreted as a pseudoscalar meson with quantum number $J^{PC} = 0^{- +}$. We develop a phenomenological approach where this pseudoscalar mimics the decays of the Standard Model Higgs boson in the vector boson decay channels. We propose that the true Higgs boson should be a heavy resonance with mass of $750 \, GeV$ as argued in Ref.~\cite{Cea:2012}. We determine the most relevant decay modes and estimate the partial decay widths and branching ratios. We also discuss briefly the experimental signatures of this heavy Higgs boson. Finally, we attempt a comparison of our theoretical expectations with recent data at $\sqrt{s} =13 \,TeV$ from ATLAS and CMS experiments in the so-called golden channel. We find that the available experimental data could be consistent with the heavy Higgs scenario.