Emergent 2HDM in LSS Little-Higgs: Musings from Flavor and Electroweak Physics

Abstract

The low energy effective theory ($\sim$ TeV) of the little-Higgs model with $SU(6)/Sp(6)$, as proposed by Low, Skiba and Smith (LSS), exhibits a two-Higgs doublet model (2HDM) structure. The symmetry dictates interesting Yukawa patterns, translating to non-trivial fermion couplings with both of the Higgs doublets. The couplings of the scalars with the fermions can induce flavor changing neutral currents (FCNC), which get constraints from flavor physics observables such as BR$(B\to X_s\gamma )$, $B_s-{\bar{B}}_s$ mixing etc. The precision measurement of $Zb\bar{b}$ vertex, the top and Higgs mass along with other Higgs coupling measurements at the Large Hadron Collider (LHC) also enforce severe restrictions on the LSS model. Direct LHC search results of beyond the Standard Model (BSM) particles also impose bounds on the masses. We probe the LSS model in view of the above constraints through a random scan in the multi-dimensional parameter space. We observe, on contrary to the general 2HDM scenario, the emergent 2HDM from the LSS model is less constrained from the flavor data and the $Zb\bar{b}$ measurement but is severely constrained form the electroweak (EW) searches at the LHC. From the flavor data and $Zb\bar{b}$, we find that the charged Higgs mass is relaxed with $\tan \beta$ being restricted to $0.5-5$, whereas the charged Higgs mass is pushed to larger than 1 TeV along with $\tan \beta$ being further restricted to $<3$ when the LHC bounds are incorporated.

arXiv comment23 pages, 3 figures, minor changes

References in corpus (54)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Theory and phenomenology of two-Higgs-doublet models
• Weak Decays Beyond Leading Logarithms
• The Minimal Composite Higgs Model
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Precision Electroweak Measurements on the Z Resonance
• Electroweak symmetry breaking from dimensional deconstruction
• Little Higgs Review
• TeV Symmetry and the Little Hierarchy Problem
• Phenomenology of the Little Higgs Model
• B_{s,d} -> l+ l- in the Standard Model with Reduced Theoretical Uncertainty
• Combined measurements of Higgs boson production and decay using up to $80$ fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=$ 13 TeV collected with the ATLAS experiment
• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Little Hierarchy, Little Higgses, and a Little Symmetry
• The top quark and Higgs boson masses and the stability of the electroweak vacuum
• Little Higgs Models and Their Phenomenology
• Update of the global electroweak fit and constraints on two-Higgs-doublet models
• Next-to-Leading QCD Corrections to B -> X_s gamma: Standard Model and Two-Higgs Doublet Model
• Flavor-phenomenology of two-Higgs-doublet models with generic Yukawa structure
• Little Higgses from an Antisymmetric Condensate
• T Parity and the Littlest Higgs
• The Other Natural Two Higgs Doublet Model
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and effective lifetime and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays
• The Little Higgs from a Simple Group
• Flavor constraints on two-Higgs-doublet models with general diagonal Yukawa couplings
• Radiative Corrections to the $Zb\bar{b}$ Vertex and Constraints on Extended Higgs Sectors
• On the Tuning and the Mass of the Composite Higgs
• Search for a light charged Higgs boson in the decay channel H+->csbar in ttbar events using pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Constraining the Two-Higgs-Doublet-Model parameter space
• New Vector-Like Fermions and Flavor Physics
• A Fermionic Top Partner: Naturalness and the LHC
• Search for charged Higgs bosons decaying into top and bottom quarks at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Search for charged Higgs bosons in the H${}^{\pm }$ $\to$ ${\tau }^{\pm }{\nu }_{\tau }$ decay channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Scalar sector of Two-Higgs-Doublet models: A mini-review
• Fundamental Composite 2HDM: SU(N) with 4 flavours
• Search for charged Higgs bosons decaying into a top and a bottom quark in the all-jet final state of pp collisions at $\sqrt{s}=$ 13 TeV
• Fundamental partial compositeness
• The experimental status of direct searches for exotic physics beyond the standard model at the Large Hadron Collider
• Type-II 2HDM under the Precision Measurements at the $Z$-pole and a Higgs Factory
• CP Violation in D0 - anti-D0 Oscillations: General Considerations and Applications to the Littlest Higgs Model with T-Parity
• Search for a charged Higgs boson decaying into top and bottom quarks in events with electrons or muons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Vacuum alignment in a composite 2HDM
• New sensitivity of current LHC measurements to vector-like quarks
• $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ Decay in the Aligned Two-Higgs-Doublet Model
• On Composite Two Higgs Doublet Models
• Extra Neutral Scalars with Vector-like Fermions at the LHC
• Impact of Yukawa-like dimension-5 operators on the Georgi-Machacek model
• Probing the Higgs boson through Yukawa force
• Status and Prospects of the Two-Higgs-Doublet SU(6)/Sp(6) little-Higgs Model and the Alignment Limit
• Charged Higgs in MSSM and Beyond
• On the flavor structure of the littlest Higgs model
• The Full Lepton Flavor of the Littlest Higgs Model with T-parity
• New physics implication of Higgs precision measurements

Cited by in corpus (2)

• Unconventional Searches for Exotic Particles at Future Lepton Colliders
• Alternative signatures of the quintuplet fermions at the LHC and future linear colliders