The phenomenology of electric dipole moments in models of scalar leptoquarks

Dekens, Wouter; Vries, Jordy de; Jung, Martin; Vos, Kimberley

doi:10.1007/jhep01(2019)069

Cited by 106 publications

(72 citation statements)

References 148 publications

(211 reference statements)

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“…(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%

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: 75%

Interpreting the electron EDM constraint

Cesarotti

Nakai

et al. 2019

J. High Energ. Phys.

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“…• paramagnetic EDMs [30,118], among others. Furthermore, as discussed at the end of section 2, a major limitation of the nuisance-free likelihood we have constructed is that several classes of observables cannot be incorporated consistently without scanning over nuisance parameters.…”

Section: Discussionmentioning

confidence: 99%

“…lequ ] 3332 does not suffer from the constraints of the scenario with C S R as the operator involves a righthanded up-type quark, so is not related by SU (2) L rotations to any FCNC operator in the 5 See also [30,77] for the R2 leptoquark scenario with complex couplings, which generates the Wilson coefficients with the relation C bcτ ντ…”

Section: Model-independent Analysis Of B → Cτ ν Transitionsmentioning

confidence: 99%

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A global likelihood for precision constraints and flavour anomalies

et al. 2019

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We present a global likelihood function in the space of dimension-six Wilson coefficients in the Standard Model Effective Field Theory (SMEFT). The likelihood includes contributions from flavour-changing neutral current B decays, lepton flavour universality tests in charged-and neutral-current B and K decays, mesonantimeson mixing observables in the K, B, and D systems, direct CP violation in K → ππ, charged lepton flavour violating B, tau, and muon decays, electroweak precision tests on the Z and W poles, the anomalous magnetic moments of the electron, muon, and tau, and several other precision observables, 265 in total. The Wilson coefficients can be specified at any scale, with the one-loop running above and below the electroweak scale automatically taken care of. The implementation of the likelihood function is based on the open source tools flavio and wilson as well as the open Wilson coefficient exchange format (WCxf) and can be installed as a Python package. It can serve as a basis either for model-independent fits or for testing dynamical models, in particular models built to address the anomalies in B physics. We discuss a number of example applications, reproducing results from the EFT and model building literature.

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“…2 This leptoquark (LQ) is a prime candidate for providing the desired correlations between tauonic B decays and EDMs. It possesses couplings to left-and righthanded quarks which is a necessary requirement for generating EDMs at the one-loop level [18,19]. It also contributes to b → cτ ν at tree level [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] and gives a very good fit to data (including polarization observables) [40][41][42][43] since it generates vector, scalar and tensor operators.…”

Section: Introductionmentioning

confidence: 99%

Correlating tauonic B decays with the neutron electric dipole moment via a scalar leptoquark

Crivellin

Saturnino

2019

Phys. Rev. D

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In this article we investigate the correlations between tauonic B meson decays (e.g. B → τ ν, B → D ( * ) τ ν, B → πτ ν) and electric dipole moments (EDMs), in particular the one of the neutron, in the context of the S1 scalar leptoquark. We perform the matching of this model on the effective field theory taking into account the leading renormalization group effect for the relevant observables. We find that one can explain the hints for new physics in b → cτ ν transitions without violating bounds from other observables. Even more interesting, it can also give sizable effects in B → τ ν, to be tested at BELLE II, which are correlated to (chromo) electric dipole operators receiving mτ /mu enhanced contributions. Therefore, given a deviation from the Standard Model (SM) expectations in B → τ ν, this model predicts a sizable neutron EDM. In fact, even if new physics has CP conserving real couplings, the CKM matrix induces a complex phase and already a 10% change of the B → τ ν branching ratio (with respect to the SM) will lead to an effect observable with the n2EDM experiment at PSI.

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The phenomenology of electric dipole moments in models of scalar leptoquarks

Cited by 106 publications

References 148 publications

Interpreting the electron EDM constraint

Interpreting the electron EDM constraint

A global likelihood for precision constraints and flavour anomalies

Correlating tauonic B decays with the neutron electric dipole moment via a scalar leptoquark

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