6533b85efe1ef96bd12c063d

RESEARCH PRODUCT

New constraints on axion-mediated P , T -violating interaction from electric dipole moments of diamagnetic atoms

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The exchange of an axionlike particle between atomic electrons and the nucleus may induce electric dipole moments (EDMs) of atoms and molecules. This interaction is described by a parity- and time-reversal-invariance-violating potential which depends on the product of a scalar ${g}^{s}$ and a pseudoscalar ${g}^{p}$ coupling constant. We consider the interaction with the specific combination of these constants, ${g}_{e}^{s}{g}_{N}^{p}$, which gives significant contributions to the EDMs of diamagnetic atoms. In this paper, we calculate these contributions to the EDMs of $^{199}\mathrm{Hg}$, $^{129}\mathrm{Xe}$, $^{211}\mathrm{Rn}$, and $^{225}\mathrm{Ra}$ for a wide range of axion masses. Comparing these results with recent experimental EDM measurements, we place new constraints on ${g}_{e}^{s}{g}_{N}^{p}$. The most stringent atomic EDM limits come from $^{199}\mathrm{Hg}$ and improve on existing laboratory limits from other experiments for axion masses exceeding ${10}^{\ensuremath{-}2}\text{ }\text{ }\mathrm{eV}$.