A resolution of the flavor problem of two Higgs doublet models with an extra <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>U</mml:mi><mml:msub><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mi>H</mml:mi></mml:mrow></mml:msub></mml:math> symmetry for Higgs flavor

Ko, Pyungwon; Omura, Yuji; Yu, Chaehyun

doi:10.1016/j.physletb.2012.09.019

Cited by 65 publications

(42 citation statements)

References 28 publications

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“…The hidden sector Higgs fields [54] or a new singlet scalar charged under U (1) H in the Type-II two Higgs doublet models with gauged Higgs flavor proposed in Ref. [91] make good examples.…”

Section: Models With An Extra Singlet Scalarmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the electroweak symmetry breaking (EWSB) sector of the SM and its various extensions. If one imposes the local gauge symmetry of the Standard Model (SM) (SU (3) c ×SU (2) L ×U (1) Y ) to the SM and any possible new physics scenarios, the SM Higgs properties will be modified by intrinsically two different ways: by new physics either coupling directly to the SM Higgs boson h, or affecting indirectly the SM Higgs properties through the mixing of h with a SM singlet scalar s. (Here s is a singlet under the SM gauge group, but may be charged under a new gauge charge and can have nonrenormalizable couplings to non-SM particles.) The models of two Higgs doublet, extra sequential and mirror fermions belong to the first category, whereas the models with a hidden sector dark matter, extra vectorlike fermions and new charged vector bosons, which can enhance the diphoton rate of the SM Higgs-like resonance, belong to the second category. We perform a global fit to data in terms of the effective Lagrangian description of two interaction eigenstates of scalar bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is more suitable to study singlet-extended scenarios discussed above compared to other approaches based on the Lagrangian of mass eigenstates. With fairly model-independent assumptions, the effective Lagrangian contains at most four free parameters still encompassing the majority of models in the literature. Interestingly, the SM gives the best fit if all data from ATLAS and CMS are used, whereas various singlet extensions can fit better to individual ATLAS or CMS data. Without further assumptions, an upper bound on the total width (or, nonstandard branching ratio) is generically obtained. Furthermore, global fit based on our parameterization can be used to probe interactions of the singlet scalar if the singlet resides below 2m W .

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Section: Models With An Extra Singlet Scalarmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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“…In Ref. [22], the SM fermions have charges under the U (1) gauge symmetry, resulting in various types of 2HDMs. As emphasized in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…As emphasized in Ref. [22], one of the interesting features in this kind of model is the absence of the pseudoscalar A. It is a common effect [24] of a spontaneously broken U (1) gauge symmetry that the pseudoscalar is eaten to become the longitudinal component of the new gauge boson Z ′ .…”

Section: Introductionmentioning

confidence: 99%

Dark two Higgs doublet model

Lee

Sher

2013

Phys. Rev. D

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We perform a detailed study of a specific Two Higgs Doublet Model (2HDM) with a U (1) gauge symmetry, instead of a typical Z2 discrete symmetry, containing a very light gauge boson Z ′ (GeV scale or below). The Standard Model (SM) fermions do not carry U (1) charges, but induced couplings to the Z ′ (called the dark Z) are generated through mixing with the SM neutral gauge bosons. Such a light Z ′ could explain some astrophysical anomalies as well as the muon g − 2 deviation, and has been the subject of great experimental interest. We consider the scenario in which the 125 GeV SM-like Higgs (H) is the heavier scalar state, and focus on the lighter neutral state (h) as well as charged Higgs. We analyze the constraints on the model from various experiments and predict novel channels to search for these Higgs scalars at the LHC. In particular, experiments looking for lepton-jets are among potentially important searches.

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“…[7], the present authors proposed gauged U(1) H symmetry, which may be considered as the origin of the Z 2 symmetry, and constructed a number of well-defined extensions of 2HDMs with only MFV. In this case, the pseudo scalar mass m A is generated by spontaneous symmetry breaking of U(1) H via nonzero VEV of a new U(1) H -charged singlet scalar Φ.…”

Section: Generalitiesmentioning

confidence: 99%

Higgs phenomenology in Type-I 2HDM with U(1) H Higgs gauge symmetry

Ko¹,

Omura

Yu³

2014

J. High Energ. Phys.

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It is well known that generic two-Higgs-doublet models (2HDMs) suffer from potentially large Higgs-mediated flavor-changing neutral current (FCNC) problem, unless additional symmetries are imposed on the Higgs fields thereby respecting the Natural Flavor Conservation Criterion (NFC) by Glashow and Weinberg. A common way to respect the NFC is to impose Z 2 symmetry which is softly broken by a dim-2 operator. Another new way is to introduce local U(1) H Higgs flavor symmetry that distinguishes one Higgs doublet from the other. In this paper, we consider the Higgs phenomenology in Type-I 2HDMs with the U(1) H symmetry with the simplest U(1) H assignments that the SM fermions are all neutral under U(1) H , and we make detailed comparison with the ordinary Type-I 2HDM. After imposing various constraints such as vacuum stability and perturbativity as well as the electroweak precision observables and collider search bounds on charged Higgs boson, we find that the allowed Higgs signal strengths in our model are much broader than those in the ordinary Type-I 2HDM, because of newly introduced U(1) H -charged singlet scalar and U(1) H gauge boson. Still the ATLAS data on gg → h → γγ cannot be accommodated. Our model could be distinguished from the ordinary 2HDM with the Z 2 symmetry in a certain parameter region and some channels. If the couplings of the new boson turn out to be close to those in the SM, it would be essential to search for extra U(1) H gauge boson and/or one more neutral scalar boson to distinguish two models.

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A resolution of the flavor problem of two Higgs doublet models with an extra U(1)H symmetry for Higgs flavor

Cited by 65 publications

References 28 publications

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Dark two Higgs doublet model

Higgs phenomenology in Type-I 2HDM with U(1) H Higgs gauge symmetry

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