Electric dipole moments from CP-violating scalar leptoquark interactions

Fuyuto, Kaori; Ramsey-Musolf, Michael J.; Shen, Tianyang

doi:10.1016/j.physletb.2018.11.016

Cited by 72 publications

(34 citation statements)

References 59 publications

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“…The upshot is that if new physics couples dominantly to a heavier up-type quark, the constraint is primarily on the electron EDM, while if new physics couples dominantly to the up quark, the constraint is primarily on the CPodd electron-nucleon interaction C S . This is consistent with results in [42]. Of course, new physics might couple to all of the quarks, in which case the flavor structure of the interaction will determine which quark gives the largest contribution.…”

Section: )supporting

confidence: 90%

“…(If the up quark is the leading coupling, then the CP-odd electron-nucleon coupling plays a more important role in the ThO measurement than the electron EDM itself.) The QULE operator could be induced by scalar leptoquark exchange at tree level, as previously discussed in [41][42][43]. It could also arise from a box diagram, a case that we discuss for the first time.…”

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confidence: 75%

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Interpreting the electron EDM constraint

Cesarotti

Nakai

et al. 2019

J. High Energ. Phys.

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The ACME collaboration has recently announced a new constraint on the electron EDM, |d e |< 1.1×10 −29 e cm, from measurements of the ThO molecule. This is a powerful constraint on CP-violating new physics: even new physics generating the EDM at two loops is constrained at the multi-TeV scale. We interpret the bound in the context of different scenarios for new physics: a general order-of-magnitude analysis for both the electron EDM and the CP-odd electronnucleon coupling; 1-loop SUSY, probing sleptons above 10 TeV; 2-loop SUSY, probing multi-TeV charginos or stops; and finally, new physics that generates the EDM via the charm quark or top quark Yukawa couplings. In the last scenario, new physics generates a "QULE operator" (q f σ µνū f ) · ( σ µνē ), which in turn generates the EDM through RG evolution. If the QULE operator is generated at tree level, this corresponds to a previously studied leptoquark model. For the first time, we also classify scenarios in which the QULE operator is generated at one loop through a box diagram, which include SUSY and leptoquark models. The electron EDM bound is the leading constraint on a wide variety of theories of CP-violating new physics interacting with the Higgs boson or the top quark. We argue that any future nonzero measurement of an electron EDM will provide a strong motivation for constructing new colliders at the highest feasible energies. arXiv:1810.07736v1 [hep-ph] 17 Oct 2018 there are many motivations for searching for physics beyond the Standard Model, three of the most important are the matter-antimatter asymmetry of our universe, the existence of dark matter, and the fine-tuning puzzle of the Higgs boson mass. The matter-antimatter asymmetry clearly indicates a need for new CP-violating physics, which could first be detected through its indirect effect on the electron EDM. As we will discuss below, EDMs also have interesting connections with WIMP dark matter (in specific models) and with the fine-tuning problem.The possibility of testing heavy new physics through electric dipole moment measurements has been studied extensively; reviews include [11][12][13][14]. Here we attempt to briefly summarize some of the important history of the topic, with apologies for inevitable omissions. Some early theoretical studies of lepton EDMs appeared already in the 1970s [15,16]. Many of the early studies of CP violation in supersymmetric theories focused on the neutron EDM [17][18][19], but studies of the electron EDM in supersymmetry commenced [20] shortly after a suggestion of Gavela and Georgi that lepton EDMs could be effective probes of new physics [21]. Subsequently, a variety of additional sources of EDMs were studied, such as 3-gluon operators [22] or two-loop diagrams mediated by electroweak bosons [23,24]. A variety of new physics scenarios have been shown to predict interesting EDMs, including: stops in SUSY [25]; electroweakinos in SUSY [26] and specifically split SUSY [27,28]; two Higgs doublet models [24,[29][30][31]; SUSY beyond the MSSM [32,33]; and fermionic...

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confidence: 90%

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confidence: 75%

Interpreting the electron EDM constraint

Cesarotti

Nakai

et al. 2019

J. High Energ. Phys.

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“…The search for additional (CP)-violation in nature, therefore, can be carried out as search for EDMs of elementary particles and search for a T -violating piece of the weak interaction, for instance among the hadrons and leptons of an atomic system [10]. The latter can arise from the tree-level exchange of a BSM mediator particle such as in the framework of leptoquark scenarios [10,11].…”

Section: Introductionmentioning

confidence: 99%

P,T -odd tensor-pseudotensor interactions in atomic Hg199 and Ra
Fleig
¹

2019
Phys. Rev. A
12
1
8
0
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Highly correlated pure ab initio relativistic configuration interaction theory is in the present paper applied to the calculation of the tensor-pseudotensor (P, T )-violating nucleon-electron interaction constant in the electronic ground states of atomic mercury and radium. The final best obtained results are R T (Hg) = −4.43 [10 −20 σ N e cm] and R T (Ra) = −15.0 [10 −20 σ N e cm]. The accuracy of the employed electronic-structure models are confirmed by determining the static electric dipole polarizability α d (Hg) = 35.7 a.u. which is in accord with the experimental value to about 5%. R T (Ra) will be useful for constraining (or obtaining) the (CP)-violating parameter C T when combined with future measurements of the electric dipole moment of the radium atom.

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“…ACME18 gives [2] d ThO = (4.3 ± 4.0) × 10 −30 e cm, with the stated bound on d e obtained by assuming C S = 0. With the estimate [9] of α ThO = 1.5 × 10 −20 , as we will see below, C S cannot be completely neglected in our case, so we shall use d ThO of ACME18 to explore the model.…”

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confidence: 99%

Cancellation mechanism for the electron electric dipole moment connected with the baryon asymmetry of the Universe

2020

Self Cite

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We elucidate a cancellation mechanism for the electric dipole moment of the electron in the general two Higgs doublet model. The impressive improvement by ACME Collaboration in 2018 suggests the presence of a new electron Yukawa coupling that brings in exquisite cancellations among dangerous diagrams, broadening the solution space for electroweak baryogenesis driven by an extra top Yukawa coupling. The cancellation mechanism calls for the new Yukawa couplings to have hierarchical structures that echo the observed pattern of the Standard Model Yukawa couplings.

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Electric dipole moments from CP-violating scalar leptoquark interactions

Cited by 72 publications

References 59 publications

Interpreting the electron EDM constraint

Interpreting the electron EDM constraint

P,T -odd tensor-pseudotensor interactions in atomic Hg199 and Ra
Fleig
¹

2019
Phys. Rev. A
12
1
8
0
View full text Add to dashboard Cite

Cancellation mechanism for the electron electric dipole moment connected with the baryon asymmetry of the Universe

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Electric dipole moments from CP-violating scalar leptoquark interactions

Cited by 72 publications

References 59 publications

Interpreting the electron EDM constraint

Interpreting the electron EDM constraint

P,T -odd tensor-pseudotensor interactions in atomic Hg199 and RaFleig1 2019Phys. Rev. A12180View full textAdd to dashboardCite

Cancellation mechanism for the electron electric dipole moment connected with the baryon asymmetry of the Universe

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P,T -odd tensor-pseudotensor interactions in atomic Hg199 and Ra
Fleig
¹

2019
Phys. Rev. A
12
1
8
0
View full text Add to dashboard Cite