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Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings

Marco Fabbrichesi, Maurizio Piai Orcid Logo, Luca Vecchi

Physical Review D, Volume: 78, Issue: 4

Swansea University Author: Maurizio Piai Orcid Logo

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DOI (Published version): 10.1103/PhysRevD.78.045009

Abstract

<p>We study a modification of the five-dimensional description of dynamical electroweak symmetry breaking inspired by the AdS/CFT correspondence. Conformal symmetry is broken in the low-energy region near the IR brane by a power-law departure from the pure AdS background. Such a modi...

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Published in: Physical Review D
ISSN: 1550-7998 1550-2368
Published: 2008
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URI: https://cronfa.swan.ac.uk/Record/cronfa1155
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spelling 2015-03-02T09:21:51.6424139 v2 1155 2012-02-23 Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings 3ce295f2c7cc318bac7da18f9989d8c3 0000-0002-2251-0111 Maurizio Piai Maurizio Piai true false 2012-02-23 SPH &#60;p&#62;We study a modification of the five-dimensional description of dynamical electroweak symmetry breaking inspired by the AdS/CFT correspondence. Conformal symmetry is broken in the low-energy region near the IR brane by a power-law departure from the pure AdS background. Such a modification—while not spoiling the identification of the IR brane with the scale of confinement—has a dramatic effect on both the coupling of the first composite states to the standard model currents and their self-couplings. Chiral symmetry breaking can take place at a scale larger than the IR cutoff. This study shows that observables, such as the precision parameter&#60;span&#62;&#60;span&#62;S&#60;/span&#62;̂&#60;/span&#62;, which depend on the couplings of the lightest composite states to the currents, are very sensitive to the details of the dynamics in the low-energy region where conformal symmetry is lost and electroweak symmetry is broken just above the scale of confinement. Therefore results of calculations of these observables in AdS/CFT inspired scenarios should be interpreted conservatively. The most important phenomenological consequence for physics at the Large Hadron Collider is that the bound on the mass scale of the heavy excitations (technirho mesons) in a realistic model is in general lower than in the pure AdS background with a simple hard-wall cutoff in the IR.&#60;/p&#62; Journal Article Physical Review D 78 4 1550-7998 1550-2368 31 12 2008 2008-12-31 10.1103/PhysRevD.78.045009 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2015-03-02T09:21:51.6424139 2012-02-23T17:02:16.0000000 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Marco Fabbrichesi 1 Maurizio Piai 0000-0002-2251-0111 2 Luca Vecchi 3
title Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings
spellingShingle Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings
Maurizio Piai
title_short Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings
title_full Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings
title_fullStr Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings
title_full_unstemmed Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings
title_sort Dynamical electroweak symmetry breaking from deformed AdS space: Vector mesons and effective couplings
author_id_str_mv 3ce295f2c7cc318bac7da18f9989d8c3
author_id_fullname_str_mv 3ce295f2c7cc318bac7da18f9989d8c3_***_Maurizio Piai
author Maurizio Piai
author2 Marco Fabbrichesi
Maurizio Piai
Luca Vecchi
format Journal article
container_title Physical Review D
container_volume 78
container_issue 4
publishDate 2008
institution Swansea University
issn 1550-7998
1550-2368
doi_str_mv 10.1103/PhysRevD.78.045009
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description &#60;p&#62;We study a modification of the five-dimensional description of dynamical electroweak symmetry breaking inspired by the AdS/CFT correspondence. Conformal symmetry is broken in the low-energy region near the IR brane by a power-law departure from the pure AdS background. Such a modification—while not spoiling the identification of the IR brane with the scale of confinement—has a dramatic effect on both the coupling of the first composite states to the standard model currents and their self-couplings. Chiral symmetry breaking can take place at a scale larger than the IR cutoff. This study shows that observables, such as the precision parameter&#60;span&#62;&#60;span&#62;S&#60;/span&#62;̂&#60;/span&#62;, which depend on the couplings of the lightest composite states to the currents, are very sensitive to the details of the dynamics in the low-energy region where conformal symmetry is lost and electroweak symmetry is broken just above the scale of confinement. Therefore results of calculations of these observables in AdS/CFT inspired scenarios should be interpreted conservatively. The most important phenomenological consequence for physics at the Large Hadron Collider is that the bound on the mass scale of the heavy excitations (technirho mesons) in a realistic model is in general lower than in the pure AdS background with a simple hard-wall cutoff in the IR.&#60;/p&#62;
published_date 2008-12-31T03:02:52Z
_version_ 1763749472126369792
score 11.037144

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