Constraints on CP violation in the Higgs sector from the ρ parameter

Pomarol, Alex; Vega, Roberto

doi:10.1016/0550-3213(94)90611-4

Cited by 124 publications

(124 citation statements)

References 35 publications

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“…These parameters are calculated in 2HDMs in refs. [50][51][52][53][54][55][56]. In the SM-like limit sin(β − α) → 1, these parameters are given to be the same formulae as those given in the inert doublet model [57].…”

Section: Oblique Parametersmentioning

confidence: 99%

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Lepton-specific two Higgs doublet model as a solution of muon g − 2 anomaly

Abe

Sato

Yagyu

2015

J. High Energ. Phys.

106

109

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Abstract:We discuss the Type-X (lepton-specific) two Higgs doublet model as a solution of the anomaly of the muon g − 2. We consider various experimental constraints on the parameter space such as direct searches for extra Higgs bosons at the LEP II and the LHC Run-I, electroweak precision observables, the decay of B s → µ + µ − , and the leptonic decay of the tau lepton. We find that the measurement of the tau decay provides the most important constraint, which excludes the parameter region that can explain the muon g − 2 anomaly at the 1σ level. We then discuss the phenomenology of extra Higgs bosons and the standard model-like Higgs boson (h) to probe the scenario favored by the g − 2 data at the collider experiments. We find that the 4τ , 3τ and 4τ + W/Z signatures are expected as the main signal of the extra Higgs bosons at the LHC. In addition, we clarify that the value of the hτ τ coupling is predicted to be the standard model value times about −1.6 to −1.0, and the branching fraction of the h → γγ mode deviates from the standard model prediction by −30% to −15%. Furthermore, we find that the exotic decay mode, h decaying into the Z boson and a light CP-odd scalar boson, is allowed, and its branching fraction can be a few percent. These deviations in the property of h will be tested by the precision measurements at future collider experiments.

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Section: Oblique Parametersmentioning

confidence: 99%

“…If we take m H = m H ± and sin(β − α) = 1, the Higgs potential respects the custodial SU(2) V symmetry [52,54], which makes ∆T = 0. The S and T parameters driven by the Gfitter group [58] are ∆S = 0.05 ± 0.11, ∆T = 0.09 ± 0.13, (3.8)…”

Section: Oblique Parametersmentioning

confidence: 99%

Lepton-specific two Higgs doublet model as a solution of muon g − 2 anomaly

Abe

Sato

Yagyu

2015

J. High Energ. Phys.

106

109

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“…The behavior of the different parameters under SUð2Þ R is shown in Table I. See also [13]. Finally, let us establish the action of the PQ symmetry previously discussed in this parametrization.…”

Section: Model and Symmetriesmentioning

confidence: 94%

Axion-Higgs interplay in the two-Higgs-doublet model

2015

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The Zhitnitsky and Dine, Fischler and Srednicki (DFSZ) model is a natural extension of the two-Higgsdoublet model containing an additional singlet, endowed with a Peccei-Quinn symmetry, and leading to a physically acceptable axion. In this paper we reexamine this model in the light of some new developments. For generic couplings the model reproduces the minimal Standard Model showing only tiny deviations (extreme decoupling scenario) and all additional degrees of freedom (with the exception of the axion) are very heavy. Recently it has been remarked that the limit where the coupling between the singlet and the two doublets becomes very small is technically natural. Combining this limit with the requirement of exact or approximate custodial symmetry, we may obtain an additional 0 þ Higgs at the weak scale, accompanied by relatively light charged and neutral pseudoscalars. The mass spectrum would then resemble that of a generic two-Higgs-doublet model, with naturally adjustable masses in spite of the large scale that the axion introduces. However, the couplings are nongeneric in this model. We use the recent constraints derived from the Higgs-WW coupling together with oblique corrections to constrain the model as much as possible.As an additional result, we work out the nonlinear parametrization of the DFSZ model in the generic case where all scalars except the lightest Higgs and the axion have masses at or beyond the TeV scale.

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“…While there are strong constraints on the mass of the light charged Higgs from flavor [35][36][37] and precision [38][39][40][41][42] observables, those limits are typically model dependent and could be relaxed when there are contributions from the other sectors of the model [43]. A direct search for a light charged Higgs, on the other hand, provides a model-independent and complementary reach.…”

Section: Jhep11(2015)051mentioning

confidence: 99%

Light charged Higgs bosons to AW/HW via top decay

Kling

Pyarelal

2015

J. High Energ. Phys.

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While current ATLAS and CMS measurements exclude a light charged Higgs (m H ± < 160 GeV) for most of the parameter region in the context of the MSSM scenarios, these bounds are significantly weakened in the Type II 2HDM once the exotic decay channel into a lighter neutral Higgs, H ± → AW/HW , is open. In this study, we examine the possibility of a light charged Higgs produced in top decay via single top or top pair production, which is the most prominent production channel for a light charged Higgs at the LHC. We consider the subsequent decay H ± → AW/HW , which can reach a sizable branching fraction at low tan β once it is kinematically permitted. With a detailed collider analysis, we obtain exclusion and discovery bounds for the 14 TeV LHC assuming the existence of a 70 GeV neutral scalar. Assuming BR(H ± → AW/HW ) = 100% and BR(A/H → τ τ ) = 8.6%, the 95% exclusion limits on BR(t → H + b) are about 0.2% and 0.03% for single top and top pair production respectively, with an integrated luminosity of 300 fb −1 . The discovery reaches are about 3 times higher. In the context of the Type II 2HDM, discovery is possible at both large tan β > 17 for 155 GeV < m H ± < 165 GeV, and small tan β < 6 over the entire mass range. Exclusion is possible in the entire tan β versus m H ± plane except for charged Higgs masses close to the top threshold. The exotic decay channel H ± → AW/HW is therefore complementary to the conventional H ± → τ ν channel.

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Constraints on CP violation in the Higgs sector from the ρ parameter

Cited by 124 publications

References 35 publications

Lepton-specific two Higgs doublet model as a solution of muon g − 2 anomaly

Lepton-specific two Higgs doublet model as a solution of muon g − 2 anomaly

Axion-Higgs interplay in the two-Higgs-doublet model

Light charged Higgs bosons to AW/HW via top decay

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