The heavy top quark in the two Higgs doublet model

Abstract

Constraints on the two Higgs doublet model are presented, assuming a top mass of 174 $\pm$ 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 $W$ mass, the full width of the $Z$ and the $b\bar{b}$ partial width of the $Z$ are combined with low energy constraints from $\Gamma (b\to s\gamma )$, $\Gamma (b\to c\tau {\bar{\nu }}_{\tau })$ and $B^0$-${\bar{B}}^0$ mixing to determine the experimentally favored configurations of the model. This combination of observables rules out small charged Higgs masses and small values of $\tan \beta$, and provides some information about the neutral Higgs masses and the mixing angle $\alpha$. In particular, constraints derived from the $\rho$ parameter rule out configurations where the charged Higgs is much heavier or much lighter than the neutral Higgses. We discuss a scenario where $\Gamma (Z\to b\bar{b})$ is enhanced relative to the standard model result, which unfortunately is on the verge of being ruled out by the combination of $\Gamma (b\to s\gamma )$ and $\rho$ parameter constraints. Implications for various extensions of the standard model are briefly discussed.

26 pages

References in corpus (9)

• The Top Quark Mass in Supersymmetric SO(10) Unification
• Evidence for Top Quark Production in $\bar{p}p$ Collisions at $\sqrt{s}=1.8$ TeV
• Theoretical Uncertainties and Phenomenological Aspects of $B\to X_s\gamma$ Decay
• Scheme Independence of the Effective Hamiltonian for $b\to s\gamma$ and $b\to sg$ Decays
• Implications of Yukawa unification for the Higgs sector in supersymmetric grand-unified models
• $b\to s\gamma$ AND $b\to sg$: A THEORETICAL REAPPRAISAL
• The Inclusive $\bar{B}\to \tau \bar{\nu }X$ Decay in Two Higgs Doublet Models
• $b\to s\gamma$ and ${\epsilon }_b$ Constraints on Two Higgs Doublet Model
• $b\to s\gamma$ and $Z\to b\overline{b}$ Constraints on Two Higgs Doublet Model

Cited by in corpus (52)

• Phenomenology of Two Higgs Doublet Models with Flavor Changing Neutral Currents
• Extra Families, Higgs Spectrum and Oblique Corrections
• Dynamical Left-Right Symmetry Breaking
• Left-Right Symmetry Breaking in NJL Approach
• Radiative Corrections to the $Zb\bar{b}$ Vertex and Constraints on Extended Higgs Sectors
• Searching for New Physics beyond the Standard Model in Electric Dipole Moment
• Little Higgs and Custodial SU(2)
• Probing wrong-sign Yukawa couplings at the LHC and a future linear collider
• QCD Corrections to Scalar Production via Heavy Quark Fusion at Hadron Colliders
• Constraining the Two-Higgs-Doublet-Model parameter space
• New Physics in CP Asymmetries and Rare B Decays
• Consistency of the Two Higgs Doublet Model and CP violation in top production at the LHC
• Gauge-independent Renormalization of the 2-Higgs-Doublet Model
• Wrong sign and symmetric limits and non-decoupling in 2HDMs
• Phase Effect of A General Two-Higgs-Doublet Model in $b\to s\gamma$
• Indirect constraints on the Georgi-Machacek model and implications for Higgs couplings
• Mass-degenerate Higgs bosons at 125 GeV in the Two-Higgs-Doublet Model
• Improving constraints on tan(beta)/m_H using B \to D tau \bar{nu}
• The branching ratio $R_b$ in the littlest Higgs model
• Probing the Flavor and CP Structure of Supersymmetric Models with K --> pi nu nubar Decays
• 2HDM Higgs-to-Higgs Decays at Next-to-Leading Order
• Constraints on Topcolor Assisted Technicolor Models from Vertex Corrections
• Enhancement of Loop Induced $H^{\pm }{W}^{\mp }{Z}^0$ Vertex in Two Higgs-doublet Model
• Very light CP-odd scalar in the Two-Higgs-Doublet Model
• The Phenomenology of a Top Quark Seesaw Model
• Pseudoscalar Higgs Bosons at the LHC: Production and Decays into Electroweak Gauge Bosons Revisited
• $R_b$ and $R_c$ in the Two Higgs Doublet Model with Flavor Changing Neutral Currents
• b -> s γdecay in the two Higgs doublet model with flavor changing neutral currents
• Weak magnetic dipole moments in two-Higgs-doublet models
• Impact of Atomic Parity Violation Measurements on Precision Electroweak Physics
• B^0-\bar{B}^0 mixing and B \to X_s γdecay in the third type 2HDM: effects of NLO QCD contributions
• Exclusive Lambda_b -> Lambda l^+ l^- decay in two Higgs doublet model
• Leading logarithmic QCD corrections to the B_s --> γγdecays in the two Higgs doublet model
• Two Higgs Doublet Model and Lepton Polarization in the B -> K tau+ tau- Decay
• Non-Decoupling Effects of Higgs Bosons on $e^{+}{e}^{-}\to W_L^{+}{W}_L^{-}$ in the Two-Doublet Model
• The exclusive $B->(K,K^{\ast }){\ell }^{+}{\ell }^{-}$ decays in a CP softly broken two Higgs doublet model
• Rare Radiative B -> τ^+ τ^- γdecay in the two Higgs doublet Model
• Implications of Yukawa Textures in the decay $H^{+}\to W^{+}\gamma$ within the 2HDM-III
• The $Z\to b\bar{b}$ Excess and Top Decay
• B^0_{d,s} - \bar{B}^0_{d,s} mixing in the model III 2HDM
• The exclusive $B\to \pi {\ell }^{+}{\ell }^{-}$ and $B\to \rho {\ell }^{+}{\ell }^{-}$ decays in the general two Higgs doublet model
• The tan(beta) - M_H^\pm bound from inclusive semi-tauonic B-decays in the MSSM
• Constraints on Two-Higgs Doublet Models at Large tan{beta} from W and Z decays
• $B\to X_s{\tau }^{+}{\tau }^{-}$ in a CP softly broken two Higgs doublet model
• Rare B -> K^* l^+ l^- decay, two Higgs doublet model, and light cone QCD sum rules
• Solutions to the R_b, R_c and alpha_s puzzles by Vector Fermions
• Anomalous charged current couplings of the tau and implications for tau compositeness and two-Higgs doublet models
• $B_{s(d)}^0-{\bar{B}}_{s(d)}^0$ mixing and new physics effects in a top quark two-Higgs doublet model
• Generalized screening theorem for Higgs decay processes in the two-doublet model
• Polarized Λ_b \to X_c τνin the SM and THDM
• $K_L\to {\pi }^o\nu \overline{\nu }$ in Extended Higgs Models
• The Advantages of Four Dimensions for Composite Higgs Models