Screening of nucleon electric dipole moments in nuclei

Inoue, Satoru; Gudkov, Vladimir; Schindler, Matthias R.; Song, Young Ho

doi:10.1103/physrevc.93.055501

Cited by 6 publications

(8 citation statements)

References 27 publications

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“…Here we repeat that the effect of the interaction between the nucleon EDM and the nuclear internal electric field [108] was not taken into account. This may suppress the nucleon EDM contribution to the nuclear EDM, although we do not evaluate it.…”

Section: Results and Analysismentioning

confidence: 99%

“…In nuclear systems, such enhancement is absent, since the system is nonrelativistic. Rather, it was recently suggested that the polarization of the nucleus due to the interaction between the EDM of the nucleon and the nuclear internal electric field can suppress the total intrinsic nucleon EDM contribution [108]. This phenomenon resembles the screening of the EDM of constituents in an electrically bound neutral system, first pointed out by Schiff [34].…”

Section: Calculation Of the Nuclear Edmmentioning

confidence: 99%

“…The third one is the suppression of the nucleon EDM contribution to the EDM of 13 C by a factor of − 1 3 , due to the antiparallel valence nucleon spin and the core-valence orbital angular momentum. There may also be additional screening effect to the nucleon EDM, generated by the interaction between the nucleon EDM and the nuclear internal electric field [108]. For the case of the Barr-Zee type diagram, the fermion EDM may also be suppressed by the electromagnetic coupling and the fractional charge of the quarks, relative to the strong coupling.…”

Section: Prospects To the Discovery Of New Physicsmentioning

confidence: 99%

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Electric dipole moment of C13

et al. 2017

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We calculate for the first time the electric dipole moment (EDM) of 13 C generated by the isovector CP-odd pion exchange nuclear force in the α-cluster model, which describes well the structures of low lying states of the 13 C nucleus. The linear dependence of the EDM of 13 C on the neutron EDM and the isovector CP-odd nuclear coupling is found to be d13 C = −0.33dn − 0.0020Ḡ(1) π . The linear enhancement factor of the CP-odd nuclear coupling is smaller than that of the deuteron, due to the difference of the structure between the 1/2 − 1 state and the opposite parity (1/2 + ) states. We clarify the role of the structure played in the enhancement of the EDM. This result provides good guiding principles to search for other nuclei with large enhancement factor. We also mention the role of the EDM of 13 C in determining the new physics beyond the standard model.

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Section: Results and Analysismentioning

confidence: 99%

Section: Calculation Of the Nuclear Edmmentioning

confidence: 99%

Section: Prospects To the Discovery Of New Physicsmentioning

confidence: 99%

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Electric dipole moment of C13

et al. 2017

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“…Rather, the nuclear spin matrix element cannot become larger than one for most of the stable nuclei, due to the strong pairing correlation. It has also recently been pointed that Schiff's screening, although being incomplete, may occur in nuclear systems [182]. The relative size between the nucleon EDM contribution and the polarization due to the CP-odd nuclear force will be discussed in the analysis.…”

Section: Electric Dipole Moments Of the Deuteron 3 H And 3 He Nucleimentioning

confidence: 96%

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Yamanaka

Hiyama

2016

J. High Energ. Phys.

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We calculate for the first time the electric dipole moment (EDM) of the deuteron, 3 H, and 3 He nuclei generated by the one-meson exchange CP-odd nuclear force in the standard model. The effective |∆S| = 1 four-quark operators are matched to the |∆S| = 1 standard model processes involving the CP phase of the Cabibbo-KobayashiMaskawa matrix at the electroweak scale and run down to the hadronic scale µ = 1 GeV according to the renormalization group evolution in the next-to-leading logarithmic order. At the hadronic scale, the hadron matrix elements are modeled in the factorization approach. We then obtain the one-meson (pion, eta meson, and kaon) exchange CP-odd nuclear force, which is the combination of the |∆S| = 1 meson-baryon vertices which issue from the penguin operator and the hyperon-nucleon transition. From this CP-odd nuclear force, the nuclear EDM is calculated with the realistic Argonne v18 interaction and the CP-odd nuclear force using the Gaussian expansion method. It is found that the EDMs of light nuclear systems are of order O(10 −31 )e cm. We also estimate the standard model contribution to other hadronic CP violating observables such as the EDMs of 6 Li, 9 Be nuclei, and the atomic EDMs of 129 Xe, 199 Hg, 211 Rn, and 225 Ra generated through the nuclear Schiff moment. We then analyze the source of theoretical uncertainties and show some possible ways to overcome them.

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“…The data of the neutron EDM is also shown for comparison [24]. of nucleons may partially suppress the EDM of the nucleus, like the screening phenomenon of Schiff [28]. The nucleon EDM contribution is important for models of new physics which contribute through the quark EDM.…”

Section: Intrinsic Nucleon Edm Contributionmentioning

confidence: 96%

Hadronic EDM and New Physics Beyond Standard Model

Yamanaka¹

2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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The nuclear electric dipole moment is a very sensitive probe of CP violation beyond the standard model, and for light nuclei, it can be evaluated accurately using the few-body calculational methods. In this contribution, we present the result of the evaluation of the electric dipole moment of 3-body and 4-body systems using the Gaussian expansion method in the ab initio approach and in the cluster model. We also give the future prospects for the discovery of new physics beyond it within the sensitivity of prepared experiments.

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Screening of nucleon electric dipole moments in nuclei

Cited by 6 publications

References 27 publications

Electric dipole moment of C13

Electric dipole moment of C13

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Hadronic EDM and New Physics Beyond Standard Model

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