Screening of nucleon electric dipole moments in atomic systems
Kota Yanase
TL;DR
This paper investigates how nucleon electric dipole moments influence atomic electric dipole moments, revealing additional contributions to the Schiff moment due to screening effects, with implications for understanding charge-parity violation.
Contribution
It explicitly derives the Schiff moment operator considering nucleon EDM screening and evaluates the correction for $^{199}$Hg within the independent particle model.
Findings
The Schiff moment operator from nucleon EDMs is confirmed.
Additional Schiff moment contributions from nuclear EDM screening are identified.
The correction for $^{199}$Hg is quantitatively evaluated.
Abstract
The electric dipole moments (EDMs) of diamagnetic atoms are expected to be sensitive to charge-parity violation particularly in nuclei through the nuclear Schiff moment. I explicitly demonstrate that the well-known form of the Schiff moment operator originating from the nucleon EDM is obtained by considering the screening of the nucleon EDMs in a neutral atom. Consequently, an additional contribution to the Schiff moment arises from the screening of the nuclear EDM induced by the interaction of the nucleon EDMs with the protons. This correction to the Schiff moment of Hg is evaluated in the independent particle model.
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