Electroweak hierarchy from conformal and custodial symmetry
We present “Custodial Naturalness” as a new mechanism to explain the separation between the electroweak (EW) scale and the scale of potential ultraviolet completions of the Standard Model (SM). We assume classical scale invariance as well as an extension of the SM scalar sector custodial symmetry to...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-02-01
|
| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269325000012 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | We present “Custodial Naturalness” as a new mechanism to explain the separation between the electroweak (EW) scale and the scale of potential ultraviolet completions of the Standard Model (SM). We assume classical scale invariance as well as an extension of the SM scalar sector custodial symmetry to SO(6). This requires a single new complex scalar field charged under a new U(1)X gauge symmetry which partially overlaps with B−L. Classical scale invariance and the high-scale scalar sector SO(6) custodial symmetry are radiatively broken by quantum effects that generate a new intermediate scale by dimensional transmutation. The little hierarchy problem is solved because the Higgs boson arises as an elementary (i.e. non-composite) pseudo-Nambu-Goldstone boson (pNGB) of the spontaneously broken SO(6) custodial symmetry. The minimal setting has the same number of parameters as the SM and predicts new physics in the form of a heavy Z′ with fixed couplings to the SM and a mass of mZ′≈4−100TeV, as well as a light but close-to invisible dilaton with a mass mhΦ≈75GeV. |
|---|---|
| ISSN: | 0370-2693 |