Top down electroweak dipole operators

Fuyuto, Kaori; Ramsey-Musolf, Michael J.

doi:10.1016/j.physletb.2018.04.022

Cited by 46 publications

(14 citation statements)

References 67 publications

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“…Chien et al (2016) investigated the constraints on dimension-six operators that couple the Higgs boson to quarks and gluons, and found that the impact of hadronic and nuclear physics uncertainties is pronounced. Cirigliano et al (2016a,b) and Fuyuto and Ramsey-Musolf (2018) considered the constraints on the top quark EDM from d e and find that the bounds are three orders of magnitude stronger than obtained from other sources.…”

Section: E Beyond-standard-model Physicsmentioning

confidence: 98%

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Electric dipole moments of atoms, molecules, nuclei, and particles

et al. 2019

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A permanent electric dipole moment (EDM) of a particle or system is a separation of charge along its angular-momentum axis and is a direct signal of T-violation and, assuming CPT symmetry, CP violation. For over sixty years EDMs have been studied, first as a signal of a parity-symmetry violation and then as a signal of CP violation that would clarify its role in nature and in theory. Contemporary motivations include the role that CP violation plays in explaining the cosmological matter-antimatter asymmetry and the search for new physics. Experiments on a variety of systems have become ever-more sensitive, but provide only upper limits on EDMs, and theory at several scales is crucial to interpret these limits. Nuclear theory provides connections from Standard-Model and Beyond-Standard-Model physics to the observable EDMs, and atomic and molecular theory reveal how CP-violation is manifest in these systems. EDM results in hadronic systems require that the Standard Model QCD parameter ofθ must be exceptionally small, which could be explained by the existence of axions -also a candidate darkmatter particle. Theoretical results on electroweak baryogenesis show that new physics is needed to explain the dominance of matter in the universe. Experimental and theoretical efforts continue to expand with new ideas and new questions, and this review provides a broad overview of theoretical motivations and interpretations as well as details about experimental techniques, experiments, and prospects. The intent is to provide specifics and context as this exciting field moves forward.

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Section: E Beyond-standard-model Physicsmentioning

confidence: 98%

“…Particularly notable is that the limits on the scalar quark-pseudoscalar electron interaction may place a lower bound on the mass scale Λ of roughly 10 3 TeV or more. This has been applied in the context of leptoquark models by Fuyuto et al (2018).…”

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confidence: 99%

Electric dipole moments of atoms, molecules, nuclei, and particles

et al. 2019

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“…[19] for an analysis of the singlet-extended SM. Furthermore, EDM constraints on dimension-six CP-violating (CPV) operators potentially relevant for EWBG are typically in the multi-TeV range [22][23][24][25]. This difference in scale can be accommodated by assuming a different threshold for the CPV dimension-six operators such that Λ CP > Λ [16].…”

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

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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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“…The processes that have been considered include top pair production [6][7][8][9][10], top decay [11,12], and top production in association with a Higgs [13,14] a Z or γ [8,14,15], or b quarks [16]. There have also been studies using low energy observables [17][18][19][20][21] as well as future lepton colliders [22][23][24][25][26][27][28]. In addition, there are several groups, TopFitter [29][30][31], SMEFiT [32], and SFitter [33] that have performed global fits to data to constrain the space of EFT operators coupling to tops.…”

Section: Jhep08(2020)036mentioning

confidence: 99%

Constraining new physics with single top production at LHC

Stolarski

Tonero

2020

J. High Energ. Phys.

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We study effects of beyond the Standard Model physics coupling third generation quarks to leptons of the first two generations. We parametrize these effects by dimension-six effective operators, and we also consider related simplified UV completions: scalar leptoquark and W models. We derive new constraints on these scenarios by using recent ATLAS measurements of differential cross sections of single top production in association with a W boson, and also show how these limits will evolve with future data. We also describe how the limits can be significantly improved by using ratios of differential distributions with different flavours of leptons.

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Top down electroweak dipole operators

Cited by 46 publications

References 67 publications

Electric dipole moments of atoms, molecules, nuclei, and particles

Electric dipole moments of atoms, molecules, nuclei, and particles

Electroweak baryogenesis and the standard model effective field theory

Constraining new physics with single top production at LHC

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