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Improved Limits on Spin-Mass Interactions

Author(s): Lee, Junyi; Almasi, Attaallah; Romalis, Michael V

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Abstract: Very light particles with CP-violating couplings to ordinary matter, such as axions or axionlike particles, can mediate long-range forces between polarized and unpolarized fermions. We describe a new experimental search for such forces between unpolarized nucleons in two 250 kg Pb weights and polarized neutrons and electrons in a He-3-K comagnetometer located about 15 cm away. We place improved constraints on the products of scalar and pseudoscalar coupling constants, g(p)(n)g(s)(N) < 4.2 x 10(-30) and g(p)(e)g(s)(N) < 1.7 x 10(-30) (95% C.L.) for axionlike particle masses less than 10(-6) eV, which represents an order of magnitude improvement over the best previous neutron laboratory limit.
Publication Date: 20-Apr-2018
Electronic Publication Date: 17-Apr-2018
Citation: Lee, Junyi, Almasi, Attaallah, Romalis, Michael. (2018). Improved Limits on Spin-Mass Interactions. PHYSICAL REVIEW LETTERS, 120 (10.1103/PhysRevLett.120.161801
DOI: doi:10.1103/PhysRevLett.120.161801
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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