Schiff screening of relativistic nucleon electric-dipole moments by electrons

Liu, C.-P.; Engel, J.

doi:10.1103/physrevc.76.028501

Cited by 11 publications

(10 citation statements)

References 8 publications

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“…Numerical evaluations of the Schiff moment [17] and their relation to the atomic EDM magnitude (for a few heavy atoms) are also known [18]. Further developments include, for example, a more general form of the Schiff moment obtained via calculations at the operator level [19], the evaluation of internal nucleon contribution to the Schiff moment [20], the enhancement of Schiff and octupole moments (by more than 2 orders of magnitude) in atoms with asymmetrically deformed nuclei with collective P and T-odd electromagnetic interactions [21], analysis of the Schiff theorem in ions and molecules [22], and other important results [23].…”

Section: Introductionmentioning

confidence: 99%

Lorentz-violating contributions to the nuclear Schiff moment and nuclear EDM

2018

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In the context of an atom endowed with nuclear electric dipole moments (EDM), we consider the effects on the Schiff moment of CPT-even Lorentz-violating (LV) terms that modify the Coulomb potential. First, we study the modifications on the Schiff moment when the nucleus interacts with the electronic cloud by means of a Coulomb potential altered only by the P-even LV components. Next, by supposing the existence of an additional intrinsic LV EDM generated by other LV sources, we assess the corrections to the Schiff moment when the interaction nucleus-electrons runs mediated by a Coulomb potential modified by both the P-odd and P-even LV components. We then use known estimates and EDM measurements to discuss upper bounds on the new Schiff moment components and the possibility of a nuclear EDM component ascribed to LV effects.

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Section: Introductionmentioning

confidence: 99%

Lorentz-violating contributions to the nuclear Schiff moment and nuclear EDM

2018

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“…It has been shown that in each case a more careful analysis of this issue is required. In an atom, to first order the nucleon EDMs can be completely shielded by the electrons . However, in general the rather significant enhancement of the electron EDM due to relativistic electron motion has been found to survive.…”

Section: Systems To Search For Edmsmentioning

confidence: 99%

Searching for electric dipole moments

Jungmann

2013

Annalen der Physik

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Searches for a permanent Electric Dipole Moment (EDM) of a fundamental particle provide a wide window for the discovery of potential New Physics. Within todays Standard Model in particle physics the well established violation of CP symmetry gives rise to EDMs which are several orders of magnitude below the present experimentally established upper bounds. On the other hand, EDMs appear quite naturally within many modern speculative theories, which have been suggested to improve the known shortcomings of the present Standard Model, e.g., the lack of giving reasons for certain established facts such as the mass hierarchy of the fundamental fermions or the number of three particle generations. They could be almost as large as the present experimental bounds. The speculative models provide for EDMs of different fundamental particles in specific ways. As there is no convincing indication, yet, which of the various extensions to the present standard theory may be more successful, a larger number of EDM searches is very well motivated. Still, even with the discovery of an EDM in one system several experiments will be required to pin down the precise nature and the underlying processes. Therefore searches are going on presently in a variety of systems, ranging from free leptons to complex condensed matter samples. These experiments utilize typically state of the art precision measurements which are often based on forefront technological developments. The experimental efforts are complemented and guided by the further development and refinement of particle theory. Here a few aspects of recent developments in this exciting field are summarized.

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“…The P , T -odd N N interactions induce nuclear EDMs, but those are completely screened in neutral atoms due to the interactions with surrounding electrons. One of the leading contributions to the EDM of a diamagnetic atom arises from the nuclear Schiff moment (NSM) induced by the P , T -odd N N interactions [17][18][19]. The experimental precision has been improved for a long time in 199 Hg [20][21][22][23][24][25][26] and 129 Xe [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Large-scale shell-model calculations of nuclear Schiff moments of $^{129}$Xe and $^{199}$Hg

Yanase,

Shimizu

2020

Preprint

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The theoretical uncertainty in the nuclear Schiff moment is an obstacle to set constraints on CP violation beyond the standard model from experimental upper bounds on atomic electric dipole moments. We perform large-scale shell-model calculations of the 129 Xe and 199 Hg nuclei with realistic effective interactions. The Schiff moments of 129 Xe and 199 Hg are reduced due to the configuration mixing by ∼ 10% from the evaluation of the independent particle model. On the other hand, the reduction is more significant in mean-field based calculations and shell-model calculations with a drastic truncation. In order to resolve the discrepancy in the Schiff moment of 199 Hg among several nuclear models, we survey low-energy nuclear structure. The large-scale shell-model calculations reveal that the Schiff moment of 199 Hg is considerably quenched in the second 1 2 − state.

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Schiff screening of relativistic nucleon electric-dipole moments by electrons

Cited by 11 publications

References 8 publications

Lorentz-violating contributions to the nuclear Schiff moment and nuclear EDM

Lorentz-violating contributions to the nuclear Schiff moment and nuclear EDM

Searching for electric dipole moments

Large-scale shell-model calculations of nuclear Schiff moments of $^{129}$Xe and $^{199}$Hg

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