Threshold effects and radiative electroweak symmetry breaking in SU(5) extensions of the MSSM
| dc.contributor.author | Dedes, A. | en |
| dc.contributor.author | Lahanas, A. B. | en |
| dc.contributor.author | Rizos, J. | en |
| dc.contributor.author | Tamvakis, K. | en |
| dc.date.accessioned | 2015-11-24T18:28:36Z | |
| dc.date.available | 2015-11-24T18:28:36Z | |
| dc.identifier.issn | 0556-2821 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16161 | |
| dc.rights | Default Licence | - |
| dc.subject | grand unified theories | en |
| dc.subject | softly broken supersymmetry | en |
| dc.subject | no-scale supergravity | en |
| dc.subject | renormalization-group equations | en |
| dc.subject | gauge coupling unification | en |
| dc.subject | standard-model | en |
| dc.subject | precision-measurements | en |
| dc.subject | top-quark | en |
| dc.subject | dimensional reduction | en |
| dc.subject | n=1 supergravity | en |
| dc.title | Threshold effects and radiative electroweak symmetry breaking in SU(5) extensions of the MSSM | en |
| heal.abstract | 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 minimal SU(5), the missing-doublet SU(5), a 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(s) and M(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 designated domain for alpha(s). In the case of the minimal SU(5), the values of alpha(s) obtained are somewhat large in comparison with the experimental average. The missing-doublet SU(5), generally, predicts smaller values of alpha(s). In both versions of the missing doublet, the high-energy threshold effects on alpha(s) operate in the opposite direction than that in the case of the minimal model,leading to small values. In the case of the Peccei-Quinn version, however, the presence of an extra intermediate scale allows us to achieve an excellent agreement with the experimental alpha(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(s) values. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.secondary | <Go to ISI>://A1997WL50300051 | - |
| heal.journalName | Physical Review D | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 1997 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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