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Title: Low scale seesaw, electron electric dipole moment, and leptogenesis in a model with spontaneous CP violation

Abstract

Strong correlations between leptogenesis and low energy CP violating leptonic processes have been shown by us to exist in the minimal left-right symmetric model with spontaneous CP violation. In this note, we investigate the implications of this model for the electric dipole moment of the electron. With an additional broken U(1){sub S} symmetry, the seesaw scale can be lowered to close to the electroweak scale. This additional symmetry also makes the connection between CP violation in quark sector to that in the lepton sector possible.

Authors:
 [1];  [2];  [3]
  1. Theoretical Physics Department, Fermilab, Batavia, Illinois 60510-0500 (United States)
  2. (United States)
  3. Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309-0390 (United States)
Publication Date:
OSTI Identifier:
20933250
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.75.015001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CP INVARIANCE; ELECTRIC DIPOLE MOMENTS; ELECTRONS; PARTICLE PRODUCTION; QUARKS; STANDARD MODEL; SYMMETRY BREAKING; U-1 GROUPS; UNITARY SYMMETRY

Citation Formats

Chen, M.-C., Department of Physics and Astronomy, University of California, Irvine, California 92697, and Mahanthappa, K. T. Low scale seesaw, electron electric dipole moment, and leptogenesis in a model with spontaneous CP violation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.015001.
Chen, M.-C., Department of Physics and Astronomy, University of California, Irvine, California 92697, & Mahanthappa, K. T. Low scale seesaw, electron electric dipole moment, and leptogenesis in a model with spontaneous CP violation. United States. doi:10.1103/PHYSREVD.75.015001.
Chen, M.-C., Department of Physics and Astronomy, University of California, Irvine, California 92697, and Mahanthappa, K. T. Mon . "Low scale seesaw, electron electric dipole moment, and leptogenesis in a model with spontaneous CP violation". United States. doi:10.1103/PHYSREVD.75.015001.
@article{osti_20933250,
title = {Low scale seesaw, electron electric dipole moment, and leptogenesis in a model with spontaneous CP violation},
author = {Chen, M.-C. and Department of Physics and Astronomy, University of California, Irvine, California 92697 and Mahanthappa, K. T.},
abstractNote = {Strong correlations between leptogenesis and low energy CP violating leptonic processes have been shown by us to exist in the minimal left-right symmetric model with spontaneous CP violation. In this note, we investigate the implications of this model for the electric dipole moment of the electron. With an additional broken U(1){sub S} symmetry, the seesaw scale can be lowered to close to the electroweak scale. This additional symmetry also makes the connection between CP violation in quark sector to that in the lepton sector possible.},
doi = {10.1103/PHYSREVD.75.015001},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • Strong correlations between leptogenesis and low energy CP violating leptonic processes have been shown by us to exist fin the minimal left-right symmetric model with spontaneous CP violation. In this note, they investigate the implications of this model for the electric dipole moment of the electron. With an additional broken U(1){sub H} symmetry, the seesaw scale can be lowered to close to the electroweak scale. This additional symmetry also makes the connection between CP violation in quark sector to that in the lepton sector possible.
  • We have shown that nonzero U{sub e3} is generated in a seesaw type softly broken A{sub 4} symmetric model through a single parameter perturbation in m{sub D} in a single element. We have explored all possible 9 cases to study the neutrino mixing angles considering the best fitted values of {delta}m{sub {center_dot}}{sup 2} and {delta}m{sub atm}{sup 2} with all parameters real. We have extended our analysis for the complex case and demonstrated large low energy CP violation (J{sub CP}{approx_equal}10{sup -2}) and m{sub ee} in addition to mixing and mass pattern. We have also investigated leptogenesis and for a reasonable choicemore » of model parameters compatible with low energy data, the Wilkinson Microwave Anisotropy Probe (WMAP) value of baryon asymmetry 6x10{sup -10} is obtained for right-handed neutrino mass scale M{sub 0}{approx_equal}10{sup 13} GeV. We have obtained a relation among the phases responsible for leptogenesis and have shown that those phases also have correlations with low energy CP violating phases.« less
  • We argue that the existence of flavor-changing Higgs-boson couplings in an extended Higgs sector, respecting the experimental bounds on such processes, is sufficient to increase by some orders of magnitude the electric dipole moment of a single quark in the Kobayashi-Maskawa model of CP violation.
  • The effective Lagrangian which exhibits explicitly the transmission of the {ital CP}-violating phases induced via the electroweak gaugino masses below the scale of the spontaneous breaking of SU(2){sub {ital L}}{times}U{sub {ital y}}(1) electroweak gauge symmetry is deduced. The formalism is used to compute the one-loop electric dipole moment of the electron including the full set of neutralino states. Contributions of neutralinos other than the photino are found to be significant. It is shown that the current data excludes maximal {ital CP} violation in the electroweak sector except for selectron masses {approx gt}200 GeV and photino masses {approx gt}750 GeV.
  • The leading contributions to the electron (or muon) electric dipole moment due to CP violation in the charged Higgs sector are at the two{endash}loop level. A careful model-independent analysis of the heavy fermion contribution is provided. We also consider some specific scenarios to demonstrate how charged Higgs sector CP violation can naturally give rise to large electric dipole moments. Numerical results show that the electron electric dipole moment in such models can lie at the experimentally accessible level. {copyright} {ital 1997} {ital The American Physical Society}