2025/09/08 by Consoli, M., Cosmai, L., Fabbri, F. +1 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2509.06479
Spontaneous symmetry breaking through the Higgs field has been experimentally confirmed as a basic ingredient of the Standard Model. However, the origin of the phenomenon may not be entirely clear, because, in perturbation theory, the vacuum turns out to be a metastable state. An alternative scenario was proposed that implies a second resonance of the Higgs field \cal H with a well delimited mass (MH)\rm Theor = 690 (30) GeV. This stabilises the potential, but, owing to an H coupling to longitudinal Ws with the same typical strength as that of the low-mass state with mh= 125 GeV, it would still remain a relatively narrow resonance. Our scope here is twofold. First, leaving out many details, we outline a simple logical path where the, apparently surprising, idea of such a second resonance follows from basic properties of Φ4 theories. Secondly, we spell out a definite experimental signature of this resonance that is clearly visible in various LHC data. As a by-product, the \cal H 3 term gives κλ= (MH/mh) ∼ 5.5 consistently with the ATLAS and CMS data.