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Against Tachyophobia

We examine the possible extension of the parameter space of the minimal supersymmetric extension of the Standard Model (MSSM), as expressed via the renormalization-group equations in terms of universal soft supersymmetry-breaking terms at the unification scale, to include tachyonic input scalar mass...

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Detalles Bibliográficos
Autores principales: Ellis, Jonathan Richard, Giedt, Joel, Lebedev, Oleg, Olive, Keith, Srednicki, Mark
Lenguaje:eng
Publicado: 2008
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.78.075006
http://cds.cern.ch/record/1111313
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author Ellis, Jonathan Richard
Giedt, Joel
Lebedev, Oleg
Olive, Keith
Srednicki, Mark
author_facet Ellis, Jonathan Richard
Giedt, Joel
Lebedev, Oleg
Olive, Keith
Srednicki, Mark
author_sort Ellis, Jonathan Richard
collection CERN
description We examine the possible extension of the parameter space of the minimal supersymmetric extension of the Standard Model (MSSM), as expressed via the renormalization-group equations in terms of universal soft supersymmetry-breaking terms at the unification scale, to include tachyonic input scalar masses. Many models with negative masses-squared for scalars at the unification scale may be viable because the small sizes of the masses-squared allow them to change signs during the renormalization-group evolution to the electroweak scale. However, in many cases, there is, in addition to the electroweak vacuum, a much deeper high-scale vacuum located along some F- and D-flat direction in the effective potential for the MSSM. We perform a numerical search for such vacua in both the CMSSM and the NUHM. We discuss the circumstances under which the existence of such a deep charge- and color-breaking vacuum is consistent with standard cosmology. A crucial role is played by the inflation--induced scalar masses, whereas thermal effects are often irrelevant.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2008
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spelling cern-11113132019-09-30T06:29:59Zdoi:10.1103/PhysRevD.78.075006http://cds.cern.ch/record/1111313engEllis, Jonathan RichardGiedt, JoelLebedev, OlegOlive, KeithSrednicki, MarkAgainst TachyophobiaParticle Physics - PhenomenologyWe examine the possible extension of the parameter space of the minimal supersymmetric extension of the Standard Model (MSSM), as expressed via the renormalization-group equations in terms of universal soft supersymmetry-breaking terms at the unification scale, to include tachyonic input scalar masses. Many models with negative masses-squared for scalars at the unification scale may be viable because the small sizes of the masses-squared allow them to change signs during the renormalization-group evolution to the electroweak scale. However, in many cases, there is, in addition to the electroweak vacuum, a much deeper high-scale vacuum located along some F- and D-flat direction in the effective potential for the MSSM. We perform a numerical search for such vacua in both the CMSSM and the NUHM. We discuss the circumstances under which the existence of such a deep charge- and color-breaking vacuum is consistent with standard cosmology. A crucial role is played by the inflation--induced scalar masses, whereas thermal effects are often irrelevant.arXiv:0806.3648CERN-PH-TH-2008-135oai:cds.cern.ch:11113132008-06-24
spellingShingle Particle Physics - Phenomenology
Ellis, Jonathan Richard
Giedt, Joel
Lebedev, Oleg
Olive, Keith
Srednicki, Mark
Against Tachyophobia
title Against Tachyophobia
title_full Against Tachyophobia
title_fullStr Against Tachyophobia
title_full_unstemmed Against Tachyophobia
title_short Against Tachyophobia
title_sort against tachyophobia
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.78.075006
http://cds.cern.ch/record/1111313
work_keys_str_mv AT ellisjonathanrichard againsttachyophobia
AT giedtjoel againsttachyophobia
AT lebedevoleg againsttachyophobia
AT olivekeith againsttachyophobia
AT srednickimark againsttachyophobia