期刊
PHYSICS LETTERS B
卷 745, 期 -, 页码 58-63出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2015.04.024
关键词
CP violation; Short range spin-dependent interaction; Axion; Axion-like particle; Ultracold neutrons; Neutron electric dipole moment
资金
- Swiss National Science Foundation [200020-144473, 200021-126562, 200020-149211, 200020-140421]
- French Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0046]
- National Science center, Poland [UMO-2012/04/M/ST2/00556]
- Foundation for Polish Science - MPD program - European Union within the European Regional Development Fund
- Fund for Scientific Research Flanders (FWO)
- KU Leuven [GOA/2010/10]
- UK's PPARC
- Swiss National Science Foundation (SNF) [200020_149211, 200020_144473, 200020_140421, 200021_126562] Funding Source: Swiss National Science Foundation (SNF)
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0046] Funding Source: Agence Nationale de la Recherche (ANR)
We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and Hg-199 atoms confined in the same volume. The measurement was performed in a similar to 1 mu T vertical magnetic holding field with the apparatus searching for a permanent electric dipole moment of the neutron at the Paul Scherrer Institute. A possible coupling between freely precessing polarized neutron spins and unpolarized nucleons of the wall material can be investigated by searching for a tiny change of the precession frequencies of neutron and mercury spins. Such a frequency change can be interpreted as a consequence of a short range spin-dependent interaction that could possibly be mediated by axions or axion-like particles. The interaction strength is proportional to the CP violating product of scalar and pseudoscalar coupling constants g(S)g(P). Our result confirms limits from complementary experiments with spin-polarized nuclei in a model-independent way. Limits from other neutron experiments are improved by up to two orders of magnitude in the interaction range of 10(-6) < lambda < 10(-4) m. (C) 2015 The Authors. Published by Elsevier B.V.
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