Implications of a heavy top quark for the two Higgs doublet model

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.207· OSTI ID:6700065

Grant, A K ^[1]

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1. Enrico Fermi Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637 (United States)

Constraints on the two Higgs doublet model are presented, assuming a top quark mass of 174[plus minus]17 GeV. We concentrate primarily on the type II'' model, where up-type quarks receive their mass from one Higgs doublet, and down-type quarks receive their mass from the second doublet. High energy constraints derived from the [ital W] mass, the full width of the [ital Z], and the [ital b[bar b]] partial width of the [ital Z] are combined with low energy constraints from [Gamma]([ital b][r arrow][ital s][gamma]), [Gamma]([ital b][r arrow][ital c][tau][bar [nu]][sub [tau]]) and [ital B][sup 0-][ital [bar B]][sup 0] mixing to determine the experimentally favored configurations of the model. This combination of observables rules out small charged Higgs boson masses and small values of tan[beta], and provides some information about the neutral Higgs boson masses and the mixing angle [alpha]. In particular, constraints derived from the [rho] parameter rule out configurations where the charged Higgs boson is much heavier or much lighter than the neutral Higgs bosons. The agreement of the model with experiment is roughly as good as that found for the minimal standard model. We discuss a scenario where [Gamma]([ital Z][r arrow][ital b[bar b]]) is enhanced relative to the standard model result, which unfortunately is on the verge of being ruled out by the combination of [Gamma]([ital b][r arrow][ital s][gamma]) and [rho] parameter constraints. Implications for various extensions of the standard model are briefly discussed.

• DOE Contract Number: FG02-90ER40560
• OSTI ID: 6700065
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662210* -- Specific Theories & Interaction Models
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
DIMENSIONS
ELEMENTARY PARTICLES
FERMIONS
HIGGS BOSONS
HIGGS MODEL
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
MASS
MATHEMATICAL MODELS
PARTICLE MODELS
POSTULATED PARTICLES
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
QUARKS
TOP PARTICLES
W MINUS BOSONS
W PLUS BOSONS
WIDTH
Z NEUTRAL BOSONS