2023/08/25 by Florian Goertz, Goertz, Florian, Álvaro Pastor-Gutiérrez +1 · 1 citation
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Cosmology and Gravitation Theories #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.2308.13594
We present evidence for new phases of the Standard Model Higgs potential. We study the Standard Model physical trajectory accounting for the Higgs curvature mass with the mass-dependent functional renormalisation group. New unstable and non-trivially stable phases are found at energies above the Planck scale and below the Abelian Landau pole. While the first aggravates the well-known metastable phase and threatens the viability of the Standard Model extrapolated to arbitrary scales, the latter can provide a well-defined ultraviolet completion. We investigate the phase diagram as a function of the top quark pole mass and study the effect of new physics through a scalar singlet portal coupling. The new non-trivial phase appears below the Planck scale in extensions of the Standard Model seeking stable trajectories. These findings have a significant impact on existing model building.