Electroweak baryogenesis with anomalous Higgs couplings

Kobakhidze, Archil; Wu, Lei; Yue, Jason

doi:10.1007/jhep04(2016)011

Cited by 33 publications

(42 citation statements)

References 66 publications

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“…It would be a great advantage if the crucial aspects of all these models can be tested in a single framework. In principle, the SM Effective Field Theory (SM-EFT) could provide such a framework [14][15][16][17][18][19][20][21] as it provides a model-independent parametrization of BSM physics. The SM-EFT assumes that any BSM degrees of freedom are sufficiently heavy, such that they can be integrated out and that their low-energy effects can be captured by effective gauge-invariant operators containing just SM degrees of freedom.…”

Section: Jhep01(2018)089mentioning

confidence: 99%

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Electroweak baryogenesis and the standard model effective field theory

Vries

Postma

Vis

et al. 2018

J. High Energ. Phys.

107

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We investigate electroweak baryogenesis within the framework of the Standard Model Effective Field Theory. The Standard Model Lagrangian is supplemented by dimension-six operators that facilitate a strong first-order electroweak phase transition and provide sufficient CP violation. Two explicit scenarios are studied that are related via the classical equations of motion and are therefore identical at leading order in the effective field theory expansion. We demonstrate that formally higher-order dimension-eight corrections lead to large modifications of the matter-antimatter asymmetry. The effective field theory expansion breaks down in the modified Higgs sector due to the requirement of a first-order phase transition. We investigate the source of the breakdown in detail and show how it is transferred to the CP-violating sector. We briefly discuss possible modifications of the effective field theory framework.

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Section: Jhep01(2018)089mentioning

confidence: 99%

“…(2.9), which is the CPV Lagrangian after applying the EOM to scenario B. The physical real top mass is now given by 20) where the last equality follows from eq. (2.12).…”

Section: Jhep01(2018)089mentioning

confidence: 99%

Electroweak baryogenesis and the standard model effective field theory

Vries

Postma

Vis

et al. 2018

J. High Energ. Phys.

107

View full text Add to dashboard Cite

show abstract

“…In several scenarios, ranging from partial compositeness [1] to supersymmetric models with light stops [2], enhanced deviations from the SM are expected in the top sector which can be relevant for electroweak baryogenesis [2,3]. Experiments at the Large Hadron Collider (LHC) offer a great opportunity to directly probe non-standard top quark couplings.…”

Section: Introductionmentioning

confidence: 99%

Is there room forCPviolation in the top-Higgs sector?

et al. 2016

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We discuss direct and indirect probes of chirality-flipping couplings of the top quark to Higgs and gauge bosons, considering both CP-conserving and CP-violating observables, in the framework of the Standard Model effective field theory. In our analysis we include current and prospective constraints from collider physics, precision electroweak tests, flavor physics, and electric dipole moments (EDMs). We find that low-energy indirect probes are very competitive, even after accounting for long-distance uncertainties. In particular, EDMs put constraints on the electroweak CP-violating dipole moments of the top that are two to three orders of magnitude stronger than existing limits. The new indirect constraint on the top EDM is given by |dt| < 5 · 10−20 e cm at 90% C.L. Introduction:The top quark might offer a first gateway to physics beyond the Standard Model (BSM), due to its large coupling to the Higgs and hence to the electroweak symmetry breaking sector. In several scenarios, ranging from partial compositeness [1] to supersymmetric models with light stops [2], enhanced deviations from the SM are expected in the top sector which can be relevant for electroweak baryogenesis [2,3]. Experiments at the Large Hadron Collider (LHC) offer a great opportunity to directly probe non-standard top quark couplings. On the other hand, these same couplings also affect via quantum corrections processes that do not involve a top quark. Such "indirect probes" give very valuable complementary information and in several cases constrain non-standard top couplings more strongly than direct searches.In this letter we discuss direct and indirect probes of chirality-flipping top-Higgs couplings, including both CP-conserving (CPC) and CP-violating (CPV) interactions, the latter being of great interest in light of Sakharov's conditions for baryogenesis [4]. Despite the vast literature on top-gluon [5][6][7][8][9][10][11][12][13][14][15][16] [37][38][39][40][41][42], the impact of electric dipole moments (EDMs) has received comparatively little attention [17,29,37,43,44]. The central new element of our work is the systematic inclusion of EDM constraints. Even after properly taking into account the hadronic and nuclear uncertainties [44], EDMs dominate the bounds on all the CPV top couplings. Our major finding is that bounds on the top EDM (weak EDM) are improved by three (two) orders of magnitude over the previous literature. As part of our analysis, we also update indirect constraints from Higgs production and decay.We work in the linear SM Effective Field Theory (SM-EFT) framework [45][46][47][48][49]. We assume that a gap exists between the scale of new physics Λ and the electroweak scale v = 246 GeV and keep only the leading terms in (v/Λ) 2 , corresponding to dimension-six operators. We assume that at the high-scale Λ the largest non-standard effects appear in the top sector, and hence set to zero all

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“…However, a non-minimal Yukawa sector containing substantial pseudoscalar admixture is not yet excluded (cf. [10]) and requires further investigation.…”

Section: Introductionmentioning

confidence: 99%

“…The justification is that the interference between the thj Feynman diagrams with tth and W W h couplings [10,25,33,34,42,[46][47][48][49][50] makes it more sensitivity to the CP-violating phase, ξ , of the top Yukawa coupling, in addition to its modulus, y t . Specifically, increased |ξ | values reduce the pp → tth cross section [25], but enhance the pp → thj cross section [10,46]. Due to this interference, the extraction of the top Yukawa coupling will require a sufficiently precise measurement of the hW W coupling, which is expected to reach the 2-5% level at 3000 fb −1 at the LHC [51].…”

Section: Introductionmentioning

confidence: 99%

Enhanced thj signal at the LHC withh→γγdecay andCP-violating top–Higgs coupling

Yue

2015

Physics Letters B

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We study the observability of non-standard top Yukawa couplings in the pp → t(→ ν b)h(→ γ γ ) j channel at 14 TeV high-luminosity LHC (HL-LHC). The small diphoton branching ratio is enhanced when the CP-violating phase, ξ , of the top-Higgs interaction is non-zero. When the modulus of the top-Higgs interaction assumes the SM value, y t = y SM t , we find that the signal significance reaches 2.7σ (7.7σ ) when ξ = 0.25π (0.5π ). Furthermore, the different couplings modify the polarisation of the top quark, and can subsequently be distinguished via asymmetries in spin correlations with the final state leptons. The diphoton decay mode is found to be significantly more promising than the previously consideredCrown

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Electroweak baryogenesis with anomalous Higgs couplings

Cited by 33 publications

References 66 publications

Electroweak baryogenesis and the standard model effective field theory

Electroweak baryogenesis and the standard model effective field theory

Is there room forCPviolation in the top-Higgs sector?

Enhanced thj signal at the LHC withh→γγdecay andCP-violating top–Higgs coupling

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