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High Energy Physics - Phenomenology

arXiv:hep-ph/0510164 (hep-ph)
[Submitted on 12 Oct 2005 (v1), last revised 16 Mar 2006 (this version, v3)]

Title:The Minimal Composite Higgs Model and Electroweak Precision Tests

Authors:Kaustubh Agashe, Roberto Contino
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Abstract: A complete analysis of the electroweak precision observables is performed within a recently proposed minimal composite Higgs model, realized as a 5-dimensional warped compactification. In particular, we compute Z->bb and the one-loop correction to the rho parameter. We find that oblique data can be easily reproduced without a significant amount of tuning in the parameters of the model, while Z->bb imposes a stronger constraint. As a consequence of the latter, some of the new fermionic resonances must have mass around 4 TeV, which corresponds to an electroweak fine tuning of a few percent. Other resonances, such as Z', can be lighter in sizeable portions of the parameter space. We discuss in detail the origin of the Z->bb constraint and we suggest several possible avenues beyond the minimal model for weakening it.
Comments: v2: an estimate of Delta rho added in the conclusions for the case of a different realization of custodial symmetry, plus a few extra comments and a reference; v3: a few typos corrected, some important changes in sections 2 and 4, a reference added. Conclusions unchanged. Version published in NPB
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:hep-ph/0510164
  (or arXiv:hep-ph/0510164v3 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0510164
Journal reference: Nucl.Phys.B742:59-85,2006
Related DOI: https://doi.org/10.1016/j.nuclphysb.2006.02.011

Submission history

From: Roberto Contino [view email]
[v1] Wed, 12 Oct 2005 19:53:31 UTC (663 KB)
[v2] Fri, 28 Oct 2005 20:27:50 UTC (663 KB)
[v3] Thu, 16 Mar 2006 16:43:26 UTC (756 KB)
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