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Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak Baryons

In many strongly-interacting models of electroweak symmetry breaking the lowest-lying observable particle is a pseudo-Goldstone boson of approximate scale symmetry, the pseudo-dilaton. Its interactions with Standard Model particles can be described using a low-energy effective nonlinear chiral Lagra...

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Autores principales: Campbell, Bruce A., Ellis, John, Olive, Keith A.
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP03(2012)026
http://cds.cern.ch/record/1400747
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author Campbell, Bruce A.
Ellis, John
Olive, Keith A.
author_facet Campbell, Bruce A.
Ellis, John
Olive, Keith A.
author_sort Campbell, Bruce A.
collection CERN
description In many strongly-interacting models of electroweak symmetry breaking the lowest-lying observable particle is a pseudo-Goldstone boson of approximate scale symmetry, the pseudo-dilaton. Its interactions with Standard Model particles can be described using a low-energy effective nonlinear chiral Lagrangian supplemented by terms that restore approximate scale symmetry, yielding couplings of the pseudo-dilaton that differ from those of a Standard Model Higgs boson by fixed factors. We review the experimental constraints on such a pseudo-dilaton in light of new data from the LHC and elsewhere. The effective nonlinear chiral Lagrangian has Skyrmion solutions that may be identified with the `electroweak baryons' of the underlying strongly-interacting theory, whose nature may be revealed by the properties of the Skyrmions. We discuss the finite-temperature electroweak phase transition in the low-energy effective theory, finding that the possibility of a first-order electroweak phase transition is resurrected. We discuss the evolution of the Universe during this transition and derive an order-of-magnitude lower limit on the abundance of electroweak baryons in the absence of a cosmological asymmetry, which suggests that such an asymmetry would be necessary if the electroweak baryons are to provide the cosmological density of dark matter. We revisit estimates of the corresponding spin-independent dark matter scattering cross section, with a view to direct detection experiments.
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spelling cern-14007472019-09-30T06:29:59Zdoi:10.1007/JHEP03(2012)026http://cds.cern.ch/record/1400747engCampbell, Bruce A.Ellis, JohnOlive, Keith A.Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak BaryonsParticle Physics - PhenomenologyIn many strongly-interacting models of electroweak symmetry breaking the lowest-lying observable particle is a pseudo-Goldstone boson of approximate scale symmetry, the pseudo-dilaton. Its interactions with Standard Model particles can be described using a low-energy effective nonlinear chiral Lagrangian supplemented by terms that restore approximate scale symmetry, yielding couplings of the pseudo-dilaton that differ from those of a Standard Model Higgs boson by fixed factors. We review the experimental constraints on such a pseudo-dilaton in light of new data from the LHC and elsewhere. The effective nonlinear chiral Lagrangian has Skyrmion solutions that may be identified with the `electroweak baryons' of the underlying strongly-interacting theory, whose nature may be revealed by the properties of the Skyrmions. We discuss the finite-temperature electroweak phase transition in the low-energy effective theory, finding that the possibility of a first-order electroweak phase transition is resurrected. We discuss the evolution of the Universe during this transition and derive an order-of-magnitude lower limit on the abundance of electroweak baryons in the absence of a cosmological asymmetry, which suggests that such an asymmetry would be necessary if the electroweak baryons are to provide the cosmological density of dark matter. We revisit estimates of the corresponding spin-independent dark matter scattering cross section, with a view to direct detection experiments.In many strongly-interacting models of electroweak symmetry breaking the lowest-lying observable particle is a pseudo-Goldstone boson of approximate scale symmetry, the pseudo-dilaton. Its interactions with Standard Model particles can be described using a low-energy effective nonlinear chiral Lagrangian supplemented by terms that restore approximate scale symmetry, yielding couplings of the pseudo-dilaton that differ from those of a Standard Model Higgs boson by fixed factors. We review the experimental constraints on such a pseudo-dilaton in light of new data from the LHC and elsewhere. The effective nonlinear chiral Lagrangian has Skyrmion solutions that may be identified with the `electroweak baryons' of the underlying strongly-interacting theory, whose nature may be revealed by the properties of the Skyrmions. We discuss the finite-temperature electroweak phase transition in the low-energy effective theory, finding that the possibility of a first-order electroweak phase transition is resurrected. We discuss the evolution of the Universe during this transition and derive an order-of-magnitude lower limit on the abundance of electroweak baryons in the absence of a cosmological asymmetry, which suggests that such an asymmetry would be necessary if the electroweak baryons are to provide the cosmological density of dark matter. We revisit estimates of the corresponding spin-independent dark matter scattering cross section, with a view to direct detection experiments.KCL-PH-TH-2011-38LCTS-2011-20CERN-PH-TH-2011-283FTPI-MINN-11-27arXiv:1111.4495UMN-TH-3019-11KCL-PH-TH-2011-38LCTS-2011-20CERN-PH-TH-2011-283UMN-TH-3019-11FTPI-MINN-11-27oai:cds.cern.ch:14007472011-11-22
spellingShingle Particle Physics - Phenomenology
Campbell, Bruce A.
Ellis, John
Olive, Keith A.
Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak Baryons
title Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak Baryons
title_full Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak Baryons
title_fullStr Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak Baryons
title_full_unstemmed Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak Baryons
title_short Phenomenology and Cosmology of an Electroweak Pseudo-Dilaton and Electroweak Baryons
title_sort phenomenology and cosmology of an electroweak pseudo-dilaton and electroweak baryons
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP03(2012)026
http://cds.cern.ch/record/1400747
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AT ellisjohn phenomenologyandcosmologyofanelectroweakpseudodilatonandelectroweakbaryons
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