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Title: Universal seesaw mechanisms for quark-lepton mass spectrum

Abstract

Problems of fermion mass hierarchies and generation mixings are investigated through universal seesaw mechanisms (USM's) in an extension of the standard model with a left-right-symmetric gauge group SU(3)[sub [ital c]][times]SU(2)[sub [ital L]][times]SU(2)[sub [ital R]][times]U(1)[sub [ital y]]. Electroweak Higgs doublets and singlets induce USM's between ordinary fermion multiplets and exotic electroweak singlets of fermions. The USM's work singly in the charged-fermion sectors to suppress their masses below the electroweak mass scale, and doubly in the neutral-fermion sector to make neutrinos superlight. The wide gap between vanishingly small neutrino masses and the 100 GeV scale of the top-quark mass is explained by multiple USM suppressions without presuming a huge Majorana mass. A global chiral U(1)[sub [ital A]] symmetry is introduced so as to circumvent the strong [ital CP] violation, to distinguish generations, and to restrict the pattern of the Yukawa interactions. Three kinds of electroweak Higgs singlets bring about USM's and cause the generation mixing leading to a realistic variety in each charge sector of the fermion mass spectrum. A fourth Higgs singlet with the largest vacuum expectation value is introduced to make the neutrino masses tiny and to make the axion invisible. By assigning chiral charges to make effective mass matricesmore » of all fermion sectors of the extended Fritzsch type, characteristics of the mass spectra of charged fermions and the quark mixing matrix are described without introducing unnatural hierarchies in the Yukawa coupling constants. Neutrinos have a spectrum comprising doubly degenerate states with a smaller mass and a singlet state with a larger mass. The vacuum mixing angle takes a small value which is favorable for explaining both the new results of the GALLEX Collaboration and the data of the Homestake and Kamiokande experiments.« less

Authors:
;  [1]
  1. Department of Physics, Kyoto Sangyo University, Kyoto 603 (Japan)
Publication Date:
OSTI Identifier:
6709087
Resource Type:
Journal Article
Journal Name:
Physical Review, D (Particles Fields); (United States)
Additional Journal Information:
Journal Volume: 47:7; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; LEPTONS; MASS FORMULAE; QUARKS; STANDARD MODEL; HIGGS BOSONS; COUPLING CONSTANTS; CP INVARIANCE; ELECTRON-POSITRON INTERACTIONS; MIXING; NEUTRINOS; Z NEUTRAL BOSONS; BOSONS; ELEMENTARY PARTICLES; FERMIONS; INTERACTIONS; INTERMEDIATE BOSONS; INTERMEDIATE VECTOR BOSONS; INVARIANCE PRINCIPLES; LEPTON-LEPTON INTERACTIONS; MASSLESS PARTICLES; MATHEMATICAL MODELS; PARTICLE INTERACTIONS; PARTICLE MODELS; POSTULATED PARTICLES; UNIFIED GAUGE MODELS; 662430* - Properties of Leptons- (1992-); 662440 - Properties of Other Particles Including Hypothetical Particles- (1992-)

Citation Formats

Sogami, I S, and Shinohara, T. Universal seesaw mechanisms for quark-lepton mass spectrum. United States: N. p., 1993. Web. doi:10.1103/PhysRevD.47.2905.
Sogami, I S, & Shinohara, T. Universal seesaw mechanisms for quark-lepton mass spectrum. United States. https://doi.org/10.1103/PhysRevD.47.2905
Sogami, I S, and Shinohara, T. 1993. "Universal seesaw mechanisms for quark-lepton mass spectrum". United States. https://doi.org/10.1103/PhysRevD.47.2905.
@article{osti_6709087,
title = {Universal seesaw mechanisms for quark-lepton mass spectrum},
author = {Sogami, I S and Shinohara, T},
abstractNote = {Problems of fermion mass hierarchies and generation mixings are investigated through universal seesaw mechanisms (USM's) in an extension of the standard model with a left-right-symmetric gauge group SU(3)[sub [ital c]][times]SU(2)[sub [ital L]][times]SU(2)[sub [ital R]][times]U(1)[sub [ital y]]. Electroweak Higgs doublets and singlets induce USM's between ordinary fermion multiplets and exotic electroweak singlets of fermions. The USM's work singly in the charged-fermion sectors to suppress their masses below the electroweak mass scale, and doubly in the neutral-fermion sector to make neutrinos superlight. The wide gap between vanishingly small neutrino masses and the 100 GeV scale of the top-quark mass is explained by multiple USM suppressions without presuming a huge Majorana mass. A global chiral U(1)[sub [ital A]] symmetry is introduced so as to circumvent the strong [ital CP] violation, to distinguish generations, and to restrict the pattern of the Yukawa interactions. Three kinds of electroweak Higgs singlets bring about USM's and cause the generation mixing leading to a realistic variety in each charge sector of the fermion mass spectrum. A fourth Higgs singlet with the largest vacuum expectation value is introduced to make the neutrino masses tiny and to make the axion invisible. By assigning chiral charges to make effective mass matrices of all fermion sectors of the extended Fritzsch type, characteristics of the mass spectra of charged fermions and the quark mixing matrix are described without introducing unnatural hierarchies in the Yukawa coupling constants. Neutrinos have a spectrum comprising doubly degenerate states with a smaller mass and a singlet state with a larger mass. The vacuum mixing angle takes a small value which is favorable for explaining both the new results of the GALLEX Collaboration and the data of the Homestake and Kamiokande experiments.},
doi = {10.1103/PhysRevD.47.2905},
url = {https://www.osti.gov/biblio/6709087}, journal = {Physical Review, D (Particles Fields); (United States)},
issn = {0556-2821},
number = ,
volume = 47:7,
place = {United States},
year = {Thu Apr 01 00:00:00 EST 1993},
month = {Thu Apr 01 00:00:00 EST 1993}
}