Bosonic seesaw mechanism in a classically conformal extension of the Standard Model
We suggest the so-called bosonic seesaw mechanism in the context of a classically conformal U(1)B-L extension of the Standard Model with two Higgs doublet fields. The U(1)B-L symmetry is radiatively broken via the Coleman–Weinberg mechanism, which also generates the mass terms for the two Higgs doublets through quartic Higgs couplings. Their masses are all positive but, nevertheless, the electroweak symmetry breaking is realized by the bosonic seesaw mechanism. Analyzing the renormalization group evolutions for all model couplings, we find that a large hierarchy among the quartic Higgs couplings, which is crucial for the bosonic seesaw mechanism to work, is dramatically reduced toward high energies. Therefore, the bosonic seesaw is naturally realized with only a mild hierarchy, if some fundamental theory, which provides the origin of the classically conformal invariance, completes our model at some high energy, for example, the Planck scale. We identify the regions of model parameters which satisfy the perturbativity of the running couplings and the electroweak vacuum stability as well as the naturalness of the electroweak scale.
- Research Organization:
- Univ. of Alabama, Tuscaloosa, AL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- Shimane University, Japan; Hokkaido University, Japan
- Grant/Contract Number:
- SC 0013680; SC0013680; 24540272; 26247038; 15H01037; 26·2428
- OSTI ID:
- 1236527
- Alternate ID(s):
- OSTI ID: 1249324; OSTI ID: 1365618
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 754 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
Similar Records
Classically conformal extended standard model, electroweak vacuum stability, and LHC Run-2 bounds
Classically conformal extended standard model and Higgs vacuum stability