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New Limits on Anomalous Spin-Spin Interactions

Author(s): Almasi, Attaallah; Lee, Junyi; Winarto, Himawan; Smiciklas, Marc; Romalis, Michael V

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Abstract: We report the results of a new search for long-range spin-dependent interactions using a Rb−21Ne atomic comagnetometer and a rotatable electron spin source based on a SmCo5 magnet with an iron flux return. By looking for signal correlations with the orientation of the spin source we set new constraints on the product of the pseudoscalar electron and neutron couplings gepgnp/ℏc < 1.7×10−14 and on the product of their axial couplings geAgnA/ℏc < 5×10−42 to a new particle with a mass of less than about 1μ eV. Our measurements improve by about 2 orders of magnitude previous constraints on such spin-dependent interactions.
Electronic Publication Date: 12-Nov-2020
Citation: Almasi, Attaallah, Lee, Junyi, Winarto, Himawan, Smiciklas, Marc, Romalis, Michael V. (New Limits on Anomalous Spin-Spin Interactions. Physical Review Letters, 125 (20), 10.1103/physrevlett.125.201802
DOI: doi:10.1103/physrevlett.125.201802
ISSN: 0031-9007
EISSN: 1079-7114
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Author's manuscript

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