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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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.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Deposited On:||27 Feb 2010 12:23|
|Last Modified:||27 Nov 2013 19:08|
|Publisher:||American Physical Society|
|Citations:||Web of Science®. Times Cited: 16|
Scopus®. Citation Count: 14
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