Second Resonance of the Standard-Model Higgs Field: Strong Indications from Theory, Lattice, and LHC Data

by George Rupp

Wednesday 18 Jun 2025, 14:00 → 15:00 Europe/Zurich

Aula Caldirola (Milano Statale)

Non-perturbative renormalisation of φ4 theory suggests two mass scales, namely one for the minimum of the quadratic effective potential, leading to mh = 125 GeV, and a second linked to the zero-point energy, giving the potential depth. Lattice simulations of the four-dimensional Ising model support such a picture, both qualitatively and quantitatively, pointing towards an additional and much heavier Higgs boson, with a mass slightly below 700 GeV. Remarkably, several small enhancements in the ballpark of 690 GeV and from different processes can be seen in both ATLAS and CMS data, with a combined statistical significance estimated at the 5σ level. Non-perturbative coupled-channel unitarity is proposed to estimate the width of the suggested resonance mainly resulting from its dominant tt ̄decay, which gives rise to mixing with the light Higgs at 125 GeV.