A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory

Abstract A first-order Electroweak Phase Transition (EWPT) could explain the observed baryon-antibaryon asymmetry and its dynamics could yield a detectable gravitational wave signature, while the underlying physics would be within the reach of colliders. The Standard Model, however, predicts a cross...

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Main Authors: José Eliel Camargo-Molina, Rikard Enberg, Johan Löfgren
Format: Article
Language:English
Published: SpringerOpen 2021-10-01
Series:Journal of High Energy Physics
Subjects:
Online Access:https://doi.org/10.1007/JHEP10(2021)127
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author José Eliel Camargo-Molina
Rikard Enberg
Johan Löfgren
author_facet José Eliel Camargo-Molina
Rikard Enberg
Johan Löfgren
author_sort José Eliel Camargo-Molina
collection DOAJ
description Abstract A first-order Electroweak Phase Transition (EWPT) could explain the observed baryon-antibaryon asymmetry and its dynamics could yield a detectable gravitational wave signature, while the underlying physics would be within the reach of colliders. The Standard Model, however, predicts a crossover transition. We therefore study the EWPT in the Standard Model Effective Field Theory (SMEFT) including dimension-six operators. A first-order EWPT has previously been shown to be possible in the SMEFT. Phenomenology studies have focused on scenarios with a tree-level barrier between minima, which requires a negative Higgs quartic coupling and a new physics scale low enough to raise questions about the validity of the EFT approach. In this work we stress that a first-order EWPT is also possible when the barrier between minima is generated radiatively, the quartic coupling is positive, the scale of new physics is higher, and there is good agreement with experimental bounds. Our calculation is done in a consistent, gauge-invariant way, and we carefully analyze the scaling of parameters necessary to generate a barrier in the potential. We perform a global fit in the relevant parameter space and explicitly find the points with a first-order transition that agree with experimental data. We also briefly discuss the prospects for probing the allowed parameter space using di-Higgs production in colliders.
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spelling doaj.art-efd5568b7dc046c68e783b199b06da2f2022-12-21T18:23:45ZengSpringerOpenJournal of High Energy Physics1029-84792021-10-0120211012110.1007/JHEP10(2021)127A new perspective on the electroweak phase transition in the Standard Model Effective Field TheoryJosé Eliel Camargo-Molina0Rikard Enberg1Johan Löfgren2Department of Physics and Astronomy, Uppsala UniversityDepartment of Physics and Astronomy, Uppsala UniversityDepartment of Physics and Astronomy, Uppsala UniversityAbstract A first-order Electroweak Phase Transition (EWPT) could explain the observed baryon-antibaryon asymmetry and its dynamics could yield a detectable gravitational wave signature, while the underlying physics would be within the reach of colliders. The Standard Model, however, predicts a crossover transition. We therefore study the EWPT in the Standard Model Effective Field Theory (SMEFT) including dimension-six operators. A first-order EWPT has previously been shown to be possible in the SMEFT. Phenomenology studies have focused on scenarios with a tree-level barrier between minima, which requires a negative Higgs quartic coupling and a new physics scale low enough to raise questions about the validity of the EFT approach. In this work we stress that a first-order EWPT is also possible when the barrier between minima is generated radiatively, the quartic coupling is positive, the scale of new physics is higher, and there is good agreement with experimental bounds. Our calculation is done in a consistent, gauge-invariant way, and we carefully analyze the scaling of parameters necessary to generate a barrier in the potential. We perform a global fit in the relevant parameter space and explicitly find the points with a first-order transition that agree with experimental data. We also briefly discuss the prospects for probing the allowed parameter space using di-Higgs production in colliders.https://doi.org/10.1007/JHEP10(2021)127Beyond Standard ModelCosmology of Theories beyond the SM
spellingShingle José Eliel Camargo-Molina
Rikard Enberg
Johan Löfgren
A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
Journal of High Energy Physics
Beyond Standard Model
Cosmology of Theories beyond the SM
title A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
title_full A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
title_fullStr A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
title_full_unstemmed A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
title_short A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
title_sort new perspective on the electroweak phase transition in the standard model effective field theory
topic Beyond Standard Model
Cosmology of Theories beyond the SM
url https://doi.org/10.1007/JHEP10(2021)127
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