Cosmological kinetic mixing

Das, Ashok; Gamboa, J.; Pino, Miguel

doi:10.1103/physrevd.91.123528

Cited by 5 publications

(8 citation statements)

References 29 publications

(10 reference statements)

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“…In light of Eq. (22), κ U and κ D are proportional to the (real non-negative) diagonal quark mass matrices M U and M D , respectively. In particular,…”

Section: Higgs-fermion Yukawa Interactionsmentioning

confidence: 99%

“…For example, no decoupling limit exists in the Z 2 -symmetric 2HDM [16]. Since the LHC Higgs data imply that the observed Higgs boson is SM-like in its properties, one can only achieve approximate Higgs alignment without decoupling by a fine-tuning of the Higgs scalar potential parameters [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, the above combinations appear in the gauge boson-Higgs boson couplings [32]. 22 22 The combination of matrix elements on the right-hand side of Eq. (E13) appears in the couplings of the charged Higgs boson.…”

mentioning

confidence: 99%

“…(20)-(22) of Ref [46]. are the conditions for a softly broken Z 2 -symmetric scalar potential and spontaneously broken CP symmetry.…”

mentioning

confidence: 99%

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Basis-independent treatment of the complex 2HDM

et al. 2020

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The complex 2HDM (C2HDM) is the most general CP-violating two-Higgs-doublet model that possesses a softly broken Z 2 symmetry. However, the physical consequences of the model cannot depend on the basis of scalar fields used to define it. Thus, to get a better sense of the significance of the C2HDM parameters, we have analyzed this model by employing a basis-independent formalism. This formalism involves transforming to the Higgs basis (which is defined up to an arbitrary complex phase) and identifying quantities that are invariant with respect to this phase degree of freedom. Using this method, we have obtained the constraints that enforce the softly broken Z 2 symmetry. One can then relate the C2HDM parameters to basis-independent quantities up to a twofold ambiguity. We then show how this remaining ambiguity is resolved. We also examine the possibility of spontaneous CP violation when the scalar potential of the C2HDM is explicitly CP conserving. Basis-independent constraints are presented that govern the presence of spontaneous CP violation. *

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“…In light of Eq. (22), κ U and κ D are proportional to the (real non-negative) diagonal quark mass matrices M U and M D , respectively. In particular,…”

Section: Higgs-fermion Yukawa Interactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

“…(20)-(22) of Ref [46]. are the conditions for a softly broken Z 2 -symmetric scalar potential and spontaneously broken CP symmetry.…”

mentioning

confidence: 99%

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Basis-independent treatment of the complex 2HDM

et al. 2020

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“…In this limit, a scalar field that is aligned in field space with the Higgs vacuum expectation value (and therefore possesses the tree-level couplings of the SM Higgs field) is a mass eigenstate, which is identified with the observed Higgs boson of mass 125 GeV [24][25][26][27] (see also Refs. [28][29][30][31]). This latter constraint, when applied to the softly-broken Z 2 -symmetric version of the 2HDM, suppresses the possibility of new CPV phenomena originating in the scalar potential (e.g., as shown in Ref.…”

mentioning

confidence: 99%

Heavy Higgs boson decays in the alignment limit of the 2HDM

Grza̧dkowski

Haber

Ogreid

et al. 2018

J. High Energ. Phys.

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The Standard Model (SM)-like couplings of the observed Higgs boson impose strong constraints on the structure of any extended Higgs sector. We consider the theoretical properties and the phenomenological implications of a generic two Higgs doublet model (2HDM). This model constitutes a simple and attractive extension of the SM that is consistent with the observation of the SM-like Higgs boson and precision electroweak observables, while providing a potential new source of CP-violation. In this paper we focus on the so-called Higgs alignment limit of the generic 2HDM, where the neutral scalar field H 1 , with the tree-level couplings of the SM Higgs boson, is a mass eigenstate that is aligned in field space with the direction of the Higgs vacuum expectation value. The properties of the two other heavier neutral Higgs scalars, H 2 and H 3 , in the alignment limit of the 2HDM are also elucidated. It is shown that the couplings of H 2 and H 3 in the alignment limit are tightly constrained and correlated. For example, in the exact alignment limit at tree level, for bosonic final states BR(H 2,3 → W + W − , ZZ, H 1 Z) = 0 and BR(H ± → W ± H 1 ) = 0, whereas for fermionic final states Γ(H 2 → ff )/Γ(H 3 → ff ) ∼ M 2 /M 3 (where M α is the mass of H α ). In some cases, the results of the alignment limit differ depending on whether or not alignment is achieved via the decoupling of heavy scalar states. In particular, in the exact alignment limit without decoupling BR(H 2,3 → H 1 H 1 ) = 0, whereas these branching ratios are nonzero in the decoupling regime. Observables that could be used to test the alignment scenario at the LHC are defined and discussed. The couplings of the Higgs bosons away from their exact alignment values are determined to leading order, and some consequences are elucidated.

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Vacuum stability and supersymmetry at high scales with two Higgs doublets

Bagnaschi

Brümmer

Buchmüller

et al. 2016

J. High Energ. Phys.

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Abstract:We investigate the stability of the electroweak vacuum for two-Higgs-doublet models with a supersymmetric UV completion. The supersymmetry breaking scale is taken to be of the order of the grand unification scale. We first study the case where all superpartners decouple at this scale. We show that contrary to the Standard Model with one Higgs doublet, matching to the supersymmetric UV completion is possible if the lowscale model contains two Higgs doublets. In this case vacuum stability and experimental constraints point towards low values of tan β 2 and pseudoscalar masses of at least about a TeV. If the higgsino superpartners of the Higgs fields are also kept light, the conclusions are similar and essentially independent of the higgsino mass. Finally, if all gauginos are also given electroweak-scale masses (split supersymmetry with two Higgs doublets), the model cannot be matched to supersymmetry at very high scales when requiring a 125 GeV Higgs. Light neutral and charged higgsinos therefore emerge as a promising signature of a supersymmetric UV completion of the Standard Model at the grand unification scale.

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Cosmological kinetic mixing

Cited by 5 publications

References 29 publications

Basis-independent treatment of the complex 2HDM

Basis-independent treatment of the complex 2HDM

Heavy Higgs boson decays in the alignment limit of the 2HDM

Vacuum stability and supersymmetry at high scales with two Higgs doublets

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