Limits on a Composite Higgs Boson

Details Limits on a Composite Higgs Boson Limits on a Composite Higgs Boson

2000-02-02

arxiv.org/abs/hep-ph/0002022v4

Phys.Rev.Lett. 85 (2000) 511-514

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 eps figures. Shortened for PRL; some references elminated

Scientific paper

10.1103/PhysRevLett.85.511

Precision electroweak data are generally believed to constrain the Higgs boson mass to lie below approximately 190 GeV at 95% confidence level. The standard Higgs model is, however, trivial and can only be an effective field theory valid below some high energy scale characteristic of the underlying non-trivial physics. Corrections to the custodial isospin violating parameter T arising from interactions at this higher energy scale dramatically enlarge the allowed range of Higgs mass. We perform a fit to precision electroweak data and determine the region in the (m_H, Delta T) plane that is consistent with experimental results. Overlaying the estimated size of corrections to T arising from the underlying dynamics, we find that a Higgs mass up to 500 GeV is allowed. We review two composite Higgs models which can realize the possibility of a phenomenologically acceptable heavy Higgs boson. We comment on the potential of improvements in the measurements of m_t and M_W to improve constraints on composite Higgs models.

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