A robust limit for the electric dipole moment of the electron

Jung, Martin

doi:10.1007/jhep05(2013)168

Cited by 43 publications

(64 citation statements)

References 46 publications

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“…[12,13] for recent detailed discussions. Furthermore, in composite systems different contributions can exhibit cancellations; this issue can already be systematically addressed for paramagnetic systems [14,15], and in the future potentially also for diamagnetic ones [16].…”

Section: Edmsmentioning

confidence: 99%

“…For paramagnetic systems, relativistic effects can actually lead to enhancement factors, if the proton number Z is large enough [27,28,29], since two contributions scale approximately with Z 3 : these are the ones from the electron EDM and the scalar electron-nucleon coupling,C S . 3 Heavy paramagnetic systems can therefore be assumed to be completely dominated by these two contributions, allowing a model-independent fit to bound and eventually determine both contributions, without the assumption of a vanishing electron-nucleon contribution [14,15]. In practice, there are two complications with this approach at present, which can however be overcome with additional measurements.…”

Section: Model-independent Constraints From Edm Measurementsmentioning

confidence: 99%

“…Lacking such (competitive) measurements, it is possible to assume e.g. the limit from Hg to be saturated by the d e ,C S contributions [15]: 4 this is a conservative procedure, since the EDM of this system is typically dominated by colour-EDM (cEDM) contributions; the coefficients of the d e ,C S contributions in Mercury are about a factor 10 8 smaller than in paramagnetic molecules. We illustrate this procedure in Fig.…”

Section: Model-independent Constraints From Edm Measurementsmentioning

confidence: 99%

“…Furthermore, this 2-dimensional constraint allows to obtain model-independent limits on the EDMs of all other heavy paramagnetic systems [15]. A significant measurement in one of these systems larger than these bounds would indicate an experimental problem.…”

Section: Model-independent Constraints From Edm Measurementsmentioning

confidence: 99%

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Theory of EDMs and LFV

Jung¹

2016

Proceedings of 16th International Conference on B-Physics at Frontier Machines — PoS(BEAUTY2016)

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Electric dipole moments and charged-lepton flavour-violating processes are extremely sensitive probes for new physics, complementary to direct searches as well as flavour-changing processes in the quark sector. Beyond the "smoking-gun" feature of a potential significant measurement, however, it is crucial to understand their implications for new physics models quantitatively. The corresponding multi-scale problem of relating the existing high-precision measurements to fundamental parameters can be approached model-independently to a large extent; however, care must be taken to include the uncertainties from especially nuclear and QCD calculations properly.

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Section: Edmsmentioning

confidence: 99%

Section: Model-independent Constraints From Edm Measurementsmentioning

confidence: 99%

Section: Model-independent Constraints From Edm Measurementsmentioning

confidence: 99%

Section: Model-independent Constraints From Edm Measurementsmentioning

confidence: 99%

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Theory of EDMs and LFV

Jung¹

2016

Proceedings of 16th International Conference on B-Physics at Frontier Machines — PoS(BEAUTY2016)

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“…Here we have assumed that parity and time-reversal violating effects arise purely from d e . An additional contribution ∼W S C S can arise from a pseudoscalar-scalar electron-nucleon coupling C S [29][30][31][32].…”

mentioning

confidence: 99%

Trapped Ions Test Fundamental Particle Physics

Hutzler

2017

Physics

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We describe the first precision measurement of the electron's electric dipole moment (d e ) using trapped molecular ions, demonstrating the application of spin interrogation times over 700 ms to achieve high sensitivity and stringent rejection of systematic errors. Through electron spin resonance spectroscopy on [3][4][5][6][7][8][9].The most precise eEDM measurements to date were performed using beams of neutral atoms or molecules [3][4][5]. These experiments benefited from excellent statistical sensitivity provided by a high flux of neutral particles, and decades of past work have produced a thorough understanding of their common sources of systematic error. Nonetheless, a crucial systematics check can be provided by independent measurements conducted using different physical systems and experimental techniques. Moreover, techniques that allow longer interrogation times offer significant potential for sensitivity improvements in eEDM searches and other tests of fundamental physics [10].In this Letter, we report on a precision measurement of the eEDM using molecular ions confined in a radio frequency (rf) [17] and our use of a rf trap allow us to attain spin precession times in excess of 700 ms-nearly 3 orders of magnitude longer than in contemporary neutral beam experiments. This exceptionally long interrogation time allows us to obtain high eEDM sensitivity despite our lower count rate. In addition, performing an experiment on trapped particles permits the measurement of spin precession fringes at arbitrary free-evolution times, making our experiment relatively immune to systematic errors associated with imperfectly characterized state preparation.Our apparatus and experimental sequence, shown schematically in Fig. 1, have been described previously [11,12,[17][18][19][20]. We produce HfF by ablation of Hf metal into a pulsed supersonic expansion of Ar and SF 6 . The neutral beam enters the rf trap, where HfF is ionized with pulsed UV lasers to form HfF þ in its ground vibronic state [18,19]. The ions are stopped by a pulsed voltage on the radial trap electrodes, then confined by dc and rf electric quadrupole gradients (with f rf ¼ 50 kHz). We next adiabatically turn on a spatially uniform electric bias field E rot ≈ 24 V=cm that rotates in the radial plane of the ion trap with frequency f rot ≈ 250 kHz, causing the ions to undergo circular motion with radius r rot ≈ 0.5 mm. A pair of magnet coils aligned with the Z axis produces an axial magnetic gradient B ¼ B 0 axgrad ð2Z − X − YÞ where jB 0 axgrad j ≈ 40 mG=cm, which in the rotating frame of the ions creates a magnetic bias field B rot ≡ jhB · E rot =E rot ij ≃ jB 0 axgrad r rot j that is parallel (antiparallel) to E rot if B 0 axgrad > 0 (<0) [11,12].Our state preparation consists of population transfer to the eEDM-sensitive 3 Δ 1 state and selective depletion of magnetic sublevels to produce a pure spin state [Figs. 1(b) and 1(c)]. Two continuous wave lasers copropagating along theẐ axis drive a Raman transition through a 119, 153001 (2017)

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The phenomenology of electric dipole moments in models of scalar leptoquarks

Dekens

Vries

Jung

et al. 2019

J. High Energ. Phys.

106

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We study the phenomenology of electric dipole moments (EDMs) induced in various scalar leptoquark models. We consider generic leptoquark couplings to quarks and leptons and match to Standard Model effective field theory. After evolving the resulting operators to low energies, we connect to EDM experiments by using up-to-date hadronic, nuclear, and atomic matrix elements. We show that current experimental limits set strong constraints on the possible CP-violating phases in leptoquark models. Depending on the quarks and leptons involved in the interaction, the existing searches for EDMs of leptons, nucleons, atoms, and molecules all play a role in constraining the CP-violating couplings. We discuss the impact of hadronic and nuclear uncertainties as well as the sensitivities that can be achieved with future EDM experiments. Finally, we study the impact of EDM constraints on a specific leptoquark model that can explain the recent B-physics anomalies. arXiv:1809.09114v2 [hep-ph]

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A robust limit for the electric dipole moment of the electron

Cited by 43 publications

References 46 publications

Theory of EDMs and LFV

Theory of EDMs and LFV

Trapped Ions Test Fundamental Particle Physics

The phenomenology of electric dipole moments in models of scalar leptoquarks

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