Electric dipole moments with and beyond flavor invariants

Smith, C.; Touati, Selim

doi:10.1016/j.nuclphysb.2017.09.013

Cited by 18 publications

(16 citation statements)

References 69 publications

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“…Now, the Yukawa interactions break this symmetry explicitly, mixing different fermion species, and assuming this breaking is small due to the small Yukawas 2 we can formally reinstate G F -invariance by promoting the Yukawa couplings to spurions in flavor space. The assumption that this is the only explicit breaking of G F is known as Minimal Flavor Violation (MFV) [11,38,39]; MFV is exact within the SM and can be extended to the full flavor structure of the SMEFT, as we will do in Sec. 3.4.…”

Section: Dipole Operators In the Sm And In The Smeftmentioning

confidence: 99%

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Electric dipole moments at one-loop in the dimension-6 SMEFT

Jonathan¹,

Theil²,

Venturini³

et al. 2021

Preprint

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In this paper we present the complete expressions of the lepton and neutron electric dipole moments (EDMs) in the Standard Model Effective Field Theory (SMEFT), up to 1-loop and dimension-6 level and including both RG running contributions and finite corrections. The latter play a fundamental role in the cases of operators that do not renormalize the dipoles, but there are also classes of operators for which they provide an important fraction, 10 − 20%, of the total 1-loop contribution, if the new physics scale is around Λ = 5 TeV. We present the full set of bounds on each individual Wilson coefficient contributing to the EDMs using both the current experimental constraints, as well as those from future experiments, which are expected to improve by at least an order of magnitude.

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Section: Dipole Operators In the Sm And In The Smeftmentioning

confidence: 99%

“…1. They have also a much less severe quark mass suppression [11]. Another very important point concerns the neutron EDM, which is also sensitive to the θ angle of QCD.…”

Section: Introductionmentioning

confidence: 99%

Electric dipole moments at one-loop in the dimension-6 SMEFT

Jonathan¹,

Theil²,

Venturini³

et al. 2021

Preprint

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show abstract

“…The anti-Hermitian part of such a chain is purely imaginary on the diagonal and thus gives the parametric form of the EDM. The minimal combination that satisfies these requirements is the commutator [103,104]. For Dirac neutrinos (M = 0), this is the whole story, however in the seesaw each pair Y † Y is associated with a sterile neutrino exchange, which is integrated out at scale M , therefore one must take the familiar replacement…”

Section: Electric Dipole Momentsmentioning

confidence: 99%

Effective approach to lepton observables: The seesaw case

Coy

Frigerio

2019

Phys. Rev. D

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In the absence of direct evidence of new physics, any ultraviolet theory can be reduced to its specific set of low-energy effective operators. As a case study, we derive the effective field theory for the seesaw extension of the Standard Model, with sterile neutrinos of mass M > m W . We systematically compute all Wilson coefficients generated at one loop. Hence, it becomes straightforward to (i) identify the seesaw parameters compatible with the smallness of neutrino masses; (ii) compute precision lepton observables, which may be sensitive to scales as large as M ∼ 10 3 TeV; and (iii) establish sharp correlations among those observables. We find that the flavour-conserving Wilson coefficients set an upper bound on the flavour-violating ones. The low-energy limits on µ → e and τ → e, µ transitions suppress flavour violation in Z and Higgs decays, as well as electric dipole moments, far beyond the experimental reach. The precision measurements of G F , m W , and Z partial decay widths set more stringent bounds than present and future limits on τ → e, µ transitions. We also present a general spurion analysis, to compare the seesaw with different models, thus assessing the discriminating potential of the effective approach.

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“…The SM predictions for EDM are extremely tiny (e.g. |d e | ∼ 10 −38 e cm [10][11][12]) because the sole complex phase, the KM phase, survives only at the four-loop level. With essentially no SM background, detection of EDM will establish the presence of NP of CPV nature.…”

Section: Introductionmentioning

confidence: 99%

Charged lepton EDM with extra Yukawa couplings

Hou

Kumar

Teunissen

2022

J. High Energ. Phys.

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In a two Higgs doublet model with extra Yukawa couplings, we assess the new physics contributions to charged lepton electric dipole moment. We focus especially on muon (and tau) EDM where in the coming decade several experiments — Muon g-2, J-PARC and PSI (and Belle II) — will push sensitivities down by several orders of magnitude. With the working assumption that extra Yukawa couplings are analogous to SM ones in strength and taking exotic scalar masses in sub-TeV range, we find that μ and τ EDM can be enhanced to values larger than new physics scenarios that scale with lepton mass. The main effect comes from the flavor-conserving extra top coupling ρtt via well-known two-loop diagrams. Deviating from our working assumption, if the muon g − 2 anomaly arises from the one-loop diagram, driven by singly enhanced lepton flavor violating ρτμ coupling, it can also induce rather large muon EDM, accessible at upcoming experiments.

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Electric dipole moments with and beyond flavor invariants

Cited by 18 publications

References 69 publications

Electric dipole moments at one-loop in the dimension-6 SMEFT

Electric dipole moments at one-loop in the dimension-6 SMEFT

Effective approach to lepton observables: The seesaw case

Charged lepton EDM with extra Yukawa couplings

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