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Title: Radiative electroweak symmetry breaking in standard model extensions

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1357705
Grant/Contract Number:
de-sc0016013
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 9; Related Information: CHORUS Timestamp: 2017-05-17 22:11:53; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Babu, K. S., Gogoladze, Ilia, and Khan, S.. Radiative electroweak symmetry breaking in standard model extensions. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.095013.
Babu, K. S., Gogoladze, Ilia, & Khan, S.. Radiative electroweak symmetry breaking in standard model extensions. United States. doi:10.1103/PhysRevD.95.095013.
Babu, K. S., Gogoladze, Ilia, and Khan, S.. Wed . "Radiative electroweak symmetry breaking in standard model extensions". United States. doi:10.1103/PhysRevD.95.095013.
@article{osti_1357705,
title = {Radiative electroweak symmetry breaking in standard model extensions},
author = {Babu, K. S. and Gogoladze, Ilia and Khan, S.},
abstractNote = {},
doi = {10.1103/PhysRevD.95.095013},
journal = {Physical Review D},
number = 9,
volume = 95,
place = {United States},
year = {Wed May 17 00:00:00 EDT 2017},
month = {Wed May 17 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.95.095013

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  • We study radiative electroweak symmetry breaking in the minimal supersymmetric standard model (MSSM). We employ the two-loop renormalization group equations for running masses and couplings taking into account sparticle threshold effects. The decoupling of each particle below its threshold is realized by a step function in all one-loop renormalization group equations. This program requires the calculation of all wave function, vertex, and mass renormalizations for all particles involved. Adapting our numerical routines to take care of the succesive decoupling of each particle below its threshold, we compute the mass spectrum of sparticles and Higgs bosons consistent with the existing experimentalmore » constraints. The effect of the threshold corrections is in general of the same order of magnitude as the two-loop contributions with the exception of the heavy Higgs bosons and those neutralino and chargino states that are nearly Higgsinos for large values of the parameter {mu}. {copyright} {ital 1996 The American Physical Society.}« less
  • We make a complete analysis of radiative symmetry breaking in the MSSM and its SU(5) extensions including low- and high-energy threshold effects in the framework of the two-loop renormalization group. In particular, we consider {ital minimal} SU(5), the {ital missing-doublet} SU(5), a {ital Peccei-Quinn}-invariant version of SU(5), as well as a version with light adjoint remnants. We derive permitted ranges for the parameters of these models in relation to predicted {alpha}{sub s} and M{sub G} values within the present experimental accuracy. The parameter regions allowed under the constraints of radiative symmetry breaking, perturbativity, and proton stability, include the experimentally designatedmore » domain for {alpha}{sub s}. In the case of the {ital minimal} SU(5), the values of {alpha}{sub s} obtained are somewhat large in comparison with the experimental average. The {ital missing-doublet} SU(5), generally, predicts smaller values of {alpha}{sub s}. In both versions of the {ital missing doublet}, the high-energy threshold effects on {alpha}{sub s} operate in the opposite direction than that in the case of the minimal model, leading to small values. In the case of the {ital Peccei-Quinn} version, however, the presence of an extra intermediate scale allows us to achieve an excellent agreement with the experimental {alpha}{sub s} values. Finally, the last considered version, with light remnants, exhibits unification of couplings at string scale at the expense, however, of rather large {alpha}{sub s} values. {copyright} {ital 1997} {ital The American Physical Society}« less
  • We study the radiative electroweak symmetry breaking and the relic abundance of neutralino dark matter in the supersymmetric type I seesaw model. In this model, there exist threshold corrections to Higgs bilinear terms coming from heavy singlet sneutrino loops, which make the soft supersymmetry breaking (SSB) mass for up-type Higgs shift at the seesaw scale and thus a minimization condition for the Higgs potential is affected. We show that the required fine-tuning between the Higgsino mass parameter {mu} and the SSB mass for up-type Higgs may be reduced at the electroweak scale, due to the threshold corrections. We also presentmore » how the parameter {mu} depends on the SSB B-parameter for heavy singlet sneutrinos. Since the property of neutralino dark matter is quite sensitive to the size of {mu}, we discuss how the relic abundance of neutralino dark matter is affected by the SSB B-parameter. Taking the SSB B-parameter of order of a few hundreds TeV, the required relic abundance of neutralino dark matter can be correctly achieved. In this case, dark matter is a mixture of bino and Higgsino, under the condition that gaugino masses are universal at the grand unification scale.« less
  • Cited by 5
  • We make a complete analysis of the Yukawa coupling unification in SU(5) extensions of the MSSM in the framework of the radiative symmetry-breaking scenario. Both logarithmic and finite threshold corrections of sparticles have been included in the determination of the gauge and Yukawa couplings at M{sub Z}. The effect of the heavy masses of each model in the renormalization group equations is also included. We find that in the minimal SU(5) model b-{tau} Yukawa unification can be achieved for too large a value of {alpha}{sub s}. On the other hand, the {ital Peccei-Quinn} version of the {ital missing doublet} model,more » with the effect of the right-handed neutrino also included, exhibits b-{tau} unification in excellent agreement with all low energy experimental data. Unification of all Yukawa couplings is also discussed. {copyright} {ital 1997} {ital The American Physical Society}« less