Constraints on two-Higgs-doublet models at large tan {beta} from W and Z decays

Journal Article · Fri Sep 01 00:00:00 EDT 2000 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.62.055014· OSTI ID:20217537

Lebedev, Oleg ^[1]; Loinaz, Will ^[1]; Takeuchi, Tatsu ^[1]

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1. Physics Department, Institute for Particle Physics and Astrophysics, Virginia Tech, Blacksburg, Virginia 24061 (United States)

We study constraints on type-II two-Higgs-doublet models at large tan {beta} 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, R{sub b}, and A{sub b} 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 {beta}=100 we obtain the 1{sigma} classical (Bayesian) bounds of m{sub H{sup {+-}}}{>=}670 GeV (370 GeV) and 1{>=}m{sub h{sup 0}}/m{sub A{sup 0}}|{sub {alpha}}{sub ={beta}}=m{sub H{sup 0}}/m{sub A{sup 0}}|{sub {alpha}}{sub =0}{>=}0.68 (0.64). The 2{sigma} bounds are weak. Currently, the Fermilab Tevatron experimental limits on lepton universality violation in W decay provide no significant constraint on the Higgs sector. (c) 2000 The American Physical Society.

• OSTI ID: 20217537
• Journal Information: Physical Review. D, Particles Fields, Vol. 62, Issue 5; Other Information: PBD: 1 Sep 2000; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
W MINUS BOSONS
W PLUS BOSONS
Z NEUTRAL BOSONS
PARTICLE DECAY
HIGGS BOSONS
FERMILAB TEVATRON
LEPTONIC DECAY
THEORETICAL DATA