Standard Model Prediction for Paramagnetic Electric Dipole Moments

Ema, Yohei; Gao, Ting; Pospelov, Maxim

doi:10.1103/physrevlett.129.231801

Cited by 22 publications

(16 citation statements)

References 38 publications

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“…Electric dipole moments of fundamental particles, such as the electron, are signatures of time-reversal symmetry violation, equivalent to violation of combined charge and parity (CP) symmetry ( 1 ). CP symmetry is broken in the standard model but only in the quark sector ( 2 ), so the coupling to leptons is weak and the predicted electron’s electric dipole moment (eEDM) several orders of magnitude below current experimental sensitivity ( 3 , 4 ). Explaining the imbalance of matter and antimatter in the Universe requires additional CP violation, beyond that present in the Standard Model ( 5 – 7 ).…”

mentioning

confidence: 99%

An improved bound on the electron’s electric dipole moment

Roussy

Caldwell

Wright

et al. 2023

Science

154

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The imbalance of matter and antimatter in our Universe provides compelling motivation to search for undiscovered particles that violate charge-parity symmetry. Interactions with vacuum fluctuations of the fields associated with these new particles will induce an electric dipole moment of the electron (eEDM). We present the most precise measurement yet of the eEDM using electrons confined inside molecular ions, subjected to a huge intramolecular electric field, and evolving coherently for up to 3 seconds. Our result is consistent with zero and improves on the previous best upper bound by a factor of ~2.4. Our results provide constraints on broad classes of new physics above 10 13 electron volts, beyond the direct reach of the current particle colliders or those likely to be available in the coming decades.

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mentioning

confidence: 99%

An improved bound on the electron’s electric dipole moment

Roussy

Caldwell

Wright

et al. 2023

Science

154

View full text Add to dashboard Cite

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“…Molecular experiments have improved the eEDM limit by a factor of around 100 in around 10 years, and are already probing parameter space outside of the reach of direct searches at high-energy colliders -up to ∼50 TeV for new CP-violating particles which couple to the electron (Andreev et al, 2018;Cesarotti et al, 2019;Alarcon et al, 2022). Since the CP-violation in the Standard Model is still many orders of magnitude smaller than the uncertainty of these experiments (Yamaguchi and Yamanaka, 2020;Ema et al, 2022), they provide a background-free probe for new physics beyond the Standard Model.…”

Section: Charge-parity Violationmentioning

confidence: 99%

Opportunities for Fundamental Physics Research with Radioactive Molecules

Arrowsmith-Kron¹,

Athanasakis-Kaklamanakis²,

Au³

et al. 2023

Preprint

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Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas of fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances in the ability to create, cool, and control complex molecules down to the quantum level, along with recent and upcoming advances in radioactive species production at several facilities around the world, create a compelling opportunity to coordinate and combine these efforts to bring precision measurement and control to molecules containing extreme nuclei. In this manuscript, we review the scientific case for studying radioactive molecules, discuss recent atomic, molecular, nuclear, astrophysical, and chemical advances which provide the foundation for their study, describe the facilities where these species are and will be produced, and provide an outlook for the future of this nascent field.

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“…The primary problem that this thesis addresses is: how to realize an experimental setup with sufficient control over its environment, with electric and magnetic field control in particular? + _ S z S e -Z Figure 1.1: Elementary particles such as the electron have in several speculative models a permanent electric dipole moment [63][64][65]. For an extended object an EDM would be represented by a distance separating opposite electric charges.…”

Section: Permanent Electric Dipole Momentsmentioning

confidence: 99%

“…Very recent calculations of so far neglected terms show that in paramagnetic atomic or molecular systems, if only one such system is used for an EDM measurement, an eEDM measurement to d equiv e ≈ 10 −35 e cm (see blue line in Fig. 2.1) or larger is possible [64,73]. In that case searches through paramagnetic EDMs leave a search space up to approximately 5×10 7 GeV or smaller energy scale.…”

Section: Pt-violation Through Eedmsmentioning

confidence: 99%

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Electric and Magnetic Field Control for Electric Dipole Moment Searches

Meijknecht

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Cover: The mysterious giftOnce, a merchant had a tent set up before the palace. He said to the king: "If you can say what is in the tent within 24 hours, it will be yours". So the king asked his 7 best scientists to investigate the contents of the tent. Of the 7, 6 entered the tent, one remained outside. It was dark in the tent. The 6 could only use the sense of touch. The one outside the tent asked the 6 what they had observed, and where that was. Pen and paper in hand, he mapped the observations of the others: "a snake", "a wall", "a spear", "a fan", "a rope", and "a trunk" (see front cover). The 7 scientists debated their observations and the map until deep into the night. Tired, one of them dozed off. He felt the ground trembling. He heard trumpets. He saw large dark shapes moving closer. He was going to get trampled... "Elephants," he exclaimed, cold sweat sticking to his clothes. It was just a dream. "But that is the answer," another said, "it is an elephant" (see back cover). The 7 scientists reported their findings to the king. He attained the mysterious gift. Adapted from the Eastern fable Blind men and an elephant.

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Standard Model Prediction for Paramagnetic Electric Dipole Moments

Cited by 22 publications

References 38 publications

An improved bound on the electron’s electric dipole moment

An improved bound on the electron’s electric dipole moment

Opportunities for Fundamental Physics Research with Radioactive Molecules

Electric and Magnetic Field Control for Electric Dipole Moment Searches

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