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Phys. Rev. D 62, 055014 (2000) [13 pages]

Constraints on two-Higgs-doublet models at large tan β from W and Z decays

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Oleg Lebedev *, Will Loinaz †, and Tatsu Takeuchi ‡
Physics Department, Institute for Particle Physics and Astrophysics, Virginia Tech, Blacksburg, Virginia 24061

Received 10 February 2000; published 11 August 2000

We study constraints on type-II two-Higgs-doublet models at large tan β from CERN LEP and SLD Z-pole data and from lepton universality violation in W decay. We perform a global fit and find that, in the context of Z decay, the LEP–SLD experimental values for lepton universality violation, Rb, and Ab all somewhat disfavor the model. Contributions from the neutral-Higgs sector can be used to constrain the scalar–pseudoscalar Higgs mass splittings. Contributions from the charged-Higgs sector allow us to constrain the charged-Higgs boson mass. For tan β=100 we obtain the 1σ classical (Bayesian) bounds of mH±>~670 GeV (370 GeV) and 1>~mh0/mA0|α=β=mH0/mA0|α=0>~0.68 (0.64). The 2σ bounds are weak. Currently, the Fermilab Tevatron experimental limits on lepton universality violation in W decay provide no significant constraint on the Higgs sector.


©2000 The American Physical Society

URL: http://link.aps.org/abstract/PRD/v62/e055014
DOI: 10.1103/PhysRevD.62.055014
PACS: 12.60.Fr, 12.15.Lk, 13.38.Be, 13.38.Dg

* Email address: lebedev@quasar.phys.vt.edu
† Email address: loinaz@alumni.princeton.edu
‡ Email address: takeuchi@vt.edu

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