The minimal composite Higgs model and electroweak precision tests

被引:174
作者
Agashe, K
Contino, R [1 ]
机构
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[2] Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA
[3] Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/j.nuclphysb.2006.02.011
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
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 -> b (b) over bar 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 -> b (b) over bar 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 -> b (b) over bar constraint and we suggest several possible avenues beyond the minimal model for weakening it. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:59 / 85
页数:27
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