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Improved Limits on Spin-Mass Interactions.
Improved Limits on Spin-Mass Interactions.
- 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]
- Subjects :
- *PARTICLES (Nuclear physics)
*CP violation
*AXIONS
Subjects
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