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Title: 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. In conclusion, 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.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Shimane Univ., Matsue (Japan)
  2. Univ. of Alabama, Tuscaloosa, AL (United States)
  3. Shimane Univ., Matsue (Japan); Hokkaido Univ., Sapporo (Japan)
Publication Date:
OSTI Identifier:
1236527
Grant/Contract Number:
SC0013680; 24540272; 26247038; 15H01037; 26·2428; SC 0013680
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 754; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
Shimane University, Japan; Hokkaido University, Japan
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS