Enhanced charged Higgs production through W -Higgs fusion in W -b scattering

If the scalar sector of the Standard Model is non-minimal, one might expect multiple generations of the hypercharge-1/2 scalar doublet analogous to the generational structure of the fermions. In this work, we examine the structure of a Higgs sector consisting of N Higgs doublets (where N ≥ 2). It is particularly convenient to work in the so-called charged Higgs basis, in which the neutral Higgs vacuum expectation value resides entirely in the first Higgs doublet, and the charged components of remaining N − 1 Higgs doublets are mass-eigenstate fields. We elucidate the interactions of the gauge bosons with the physical Higgs scalars and the Goldstone bosons and show that they are determined by an N × 2N matrix. This matrix depends on (N − 1)(2N − 1) real parameters that are associated with the mixing of the neutral Higgs fields in the charged Higgs basis. Among these parameters, N − 1 are unphysical (and can be removed by rephasing the physical charged Higgs fields), and the remaining 2(N − 1) 2 parameters are physical. We also demonstrate a particularly simple form for the cubic interaction and some of the quartic interactions of the Goldstone bosons with the physical Higgs scalars. These results are applied in the derivation of Higgs coupling sum rules and tree-level unitarity bounds that restrict the size of the quartic scalar couplings. In particular, new applications to three Higgs doublet models with an order-4 CP symmetry and with a Z 3 symmetry, respectively, are presented.

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“…In the case of the 2HDM, two of the sum rules that are usually exhibited (see, e.g., refs. [19,20,43,44]) are…”

Section: Coupling Relations and Sum Rules From The Lagrangianmentioning

confidence: 99%

“…43) where Z 345 ≡ Z 3 + Z 4 + Re Z 5 . To identify the neutral Higgs mass-eigenstates, we diagonalize the squared-mass matrix M 2 .…”

mentioning

confidence: 99%

Multi-Higgs doublet models: physical parametrization, sum rules and unitarity bounds

Bento

Haber

Romão

et al. 2017

J. High Energ. Phys.

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“…• Limits on charged Higgs bosons decaying to τ ν final states valid for the 2HDM-II might be invalidated in the framework of the 2HDM-Y where the H ± → τ ν decay rate behaves like 1/ tan β for large tan β. This also applies to heavy H 0 /A 0 searches in the τ + τ − channel because also the H 0 τ + τ − and A 0 τ + τ − couplings are proportional to 1/ tan β for large tan β [29]. A detail analysis of the status of charged Higgs in the four types 2HDM can be found in [30].…”

Section: B Constraints and Benchmark Pointsmentioning

confidence: 98%

Top quark polarization as a probe of charged Higgs bosons

2018

Self Cite

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We study the production and decay of a heavy charged Higgs boson in the bg → tH − and H − → bt processes at the Large Hadron Collider (LHC). We show that the chiral structure of the H − tb vertex entering both stages is sensitive to the underlying Higgs mechanism of Electro-Weak Symmetry Breaking (EWSB) and we specifically demonstrate that one could distinguish between two popular realizations of a 2-Higgs Double Model (2HDM) embedding a new H ± state, i.e., those with Type-I and -Y Yukawa couplings. The chiral structure of such a vertex, which is different in the two cases, in turn triggers a particular spin state of the top quark which is then transmitted to its decay products. Hence, both inclusive rates and exclusive observables can be used to extract the presence of such a charged Higgs boson state in LHC data.

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“…10 has been explored in Ref. [243], where it is pointed out that in the alignment limit, with neutral Higgs masses close, M A M H , there is a strong cancellation among different diagrams. Thus, if M A should be light, this mechanism would be numerically important.…”

Section: Other Scenariosmentioning

confidence: 99%

Prospects for charged Higgs searches at the LHC

et al. 2017

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The goal of this report is to summarize the current situation and discuss possible search strategies for charged scalars, in non-supersymmetric extensions of the Standard Model at the LHC. Such scalars appear in Multi-HiggsDoublet models, in particular in the popular Two-HiggsDoublet model, allowing for charged and additional neutral Higgs bosons. These models have the attractive property that electroweak precision observables are automatically in agreement with the Standard Model at the tree level. For the most popular version of this framework, Model II, a discovery of a charged Higgs boson remains challenging, since the parameter space is becoming very constrained, and the QCD background is very high. We also briefly comment on models with dark matter which constrain the corresponding charged a e-mail: Maria.Krawczyk@fuw.edu.pl b e-mail: Per.Osland@uib.no scalars that occur in these models. The stakes of a possible discovery of an extended scalar sector are very high, and these searches should be pursued in all conceivable channels, at the LHC and at future colliders.

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Enhanced charged Higgs production through W -Higgs fusion in W -b scattering

Cited by 9 publications

References 49 publications

Multi-Higgs doublet models: physical parametrization, sum rules and unitarity bounds

Multi-Higgs doublet models: physical parametrization, sum rules and unitarity bounds

Top quark polarization as a probe of charged Higgs bosons

Prospects for charged Higgs searches at the LHC

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