| Speaker: | Belen Gavela (Universidad Autónoma de Madrid and IFT-UAM/CSIC) |
|---|---|
| Title: | Higgs near-criticality af future colliders |
| Date (JST): | Fri, Apr 18, 2025, 13:30 - 15:00 |
| Place: | Seminar Room A |
| Abstract: |
I explore the concept of near criticality of the Higgs potential, as an alternative to the usual naturalness criteria to confront the electroweak hierarchy problem. In this context, the smallness of the Higgs mass may be a byproduct of the metastability of the Higgs potential. Metastability bounds on the Higgs mass result in general. Strong bounds require new physics capable of lowering the scale at which the Higgs quartic coupling turns negative, without destabilising the electroweak vacuum entirely. The new physics scale should generically be within reach of future experiments. As a concrete and ultraviolet-complete realisation, I will explore the low-scale Majoron model of neutrino masses, showing that it automatically contains the two key elements for a viable scenario. I will also demonstrate that FCC-ee can cover large regions of its fermionic parameter space of interest, while FCC-hh shows some reach to its heavy scalar sector. |
