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Improved Limits on Spin-Mass Interactions.

Improved Limits on Spin-Mass Interactions.

Authors :
Junyi Lee
Almasi, Attaallah
Romalis, Michael
Source :
Physical Review Letters. 4/20/2018, Vol. 120 Issue 16, p1-1. 1p.
Publication Year :
2018

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 ³He-K comagnetometer located about 15 cm away. We place improved constraints on the products of scalar and pseudoscalar coupling constants, gpngsN<4.2×10-30 and gpegsN<1.7×10-30 (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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00319007
Volume :
120
Issue :
16
Database :
Academic Search Index
Journal :
Physical Review Letters
Publication Type :
Academic Journal
Accession number :
129325947
Full Text :
https://doi.org/10.1103/PhysRevLett.120.161801