A hidden, heavier resonance of the Higgs field

TL;DR

This paper proposes the possibility of a heavier Higgs resonance around 700 GeV, supported by theoretical calculations and lattice simulations, which could explain some experimental excesses and challenge the current understanding of the Higgs sector.

Contribution

It introduces the idea of a second, heavier Higgs resonance around 700 GeV, supported by analytic and lattice methods, suggesting a new perspective on the Higgs field structure.

Findings

A potential new Higgs resonance at ~700 GeV could explain ATLAS 4-lepton excess.

The heavier resonance would couple strongly to vector bosons, similar to the known Higgs.

Implications for radiative corrections and Higgs phenomenology are discussed.

Abstract

In Veltman's original view, the Standard Model with a large Higgs particle mass of about 1 TeV was the natural completion of non-renormalizable Glashow model. This mass was thus a second threshold for weak interactions, as the W mass was for the non-renormalizable 4-fermion V-A theory. Today, after the observation of the narrow scalar resonance at 125 GeV, Veltman's large-mass idea seems to be ruled out. Yet, this is not necessarily true. Depending on the description of SSB in $\Phi^4$ theory, and by combining analytic calculations and lattice simulations, besides the known particle at 125 GeV, a new resonance of the Higgs field may also show up around 700 GeV. The peculiarity, though, is that this heavier state would couple to longitudinal vector bosons with the same typical strength of the low-mass state and thus represent a relatively narrow resonance. In this way, such hypothetical new resonance would naturally fit with some excess of 4-lepton events observed by ATLAS around 680 GeV. Analogous data from CMS are needed to confirm or disprove this interpretation. Implications of a two-mass structure for radiative corrections are also discussed.