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

Abstract

The exchange of an axion-like 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 ${}^{199}$Hg, ${}^{129}$Xe, ${}^{211}$Rn and ${}^{225}$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 ${}^{199}$Hg and improve on existing laboratory limits from other experiments for axion masses exceeding $10^{-2}$ eV.

5 pages, 1 figure; v3: published version

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• Search for New Physics with Atoms and Molecules
• Stellar cooling bounds on new light particles: plasma mixing effects
• Limits on a CP-violating scalar axion-nucleon interaction
• Calculation of P,T-odd electric dipole moments for diamagnetic atoms ${}^{129}$Xe, ${}^{171}$Yb, ${}^{199}$Hg, ${}^{211}$Rn, and ${}^{225}$Ra
• Nuclear spin-dependent interactions: Searches for WIMP, Axion and Topological Defect Dark Matter, and Tests of Fundamental Symmetries
• New constraints for CP-violating forces between nucleons in the range 10-4 cm - 1 cm
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