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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-30923

Gillioz, M (2009). One light composite Higgs boson facing electroweak precision tests. Physical Review D, 80(5):055003 .

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Abstract

We study analytically and numerically the bounds imposed by the electroweak precision tests on a minimal composite Higgs model. The model is based on spontaneous SO(5)→SO(4) breaking, so that an approximate custodial symmetry is preserved. The Higgs arises as a pseudo-Goldstone boson at a scale below the electroweak symmetry breaking scale. We show that one can satisfy the electroweak precision constraints without much fine-tuning. This is the case if the left-handed top quark is fully composite, which gives a mass spectrum within the reach of the LHC. However a composite top quark is strongly disfavored by flavor physics. The alternative is to have a singlet top partner at a scale much lighter than the rest of the composite fermions. In this case the top partner would be light enough to be produced significantly at the LHC.

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17 citations in Web of Science®
14 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
DDC:530 Physics
Language:English
Date:2009
Deposited On:27 Feb 2010 12:23
Last Modified:27 Nov 2013 19:08
Publisher:American Physical Society
ISSN:1550-2368
Publisher DOI:10.1103/PhysRevD.80.055003
Related URLs:http://arxiv.org/abs/0806.3450

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