Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-12
Nucl.Phys.B742:59-85,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2: an estimate of Delta rho added in the conclusions for the case of a different realization of custodial symmetry, plus a fe
Scientific paper
10.1016/j.nuclphysb.2006.02.011
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.
Agashe Kaustubh
Contino Roberto
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