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16 April 2024

» arxiv » 1412.3679

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Constraining interactions mediated by axion-like particles with ultracold neutrons
S. Afach ; G. Ban ; G. Bison ; K. Bodek ; M. Burghoff ; M. Daum ; M. Fertl ; B. Franke ; Z. D. Grujić ; V. Hélaine ; M. Kasprzak ; Y. Kermaïdic ; K. Kirch ; P. Knowles ; H.-C. Koch ; S. Komposch ; A. Kozela ; J. Krempel ; B. Lauss ; T. Lefort ; Y. Lemière ; A. Mtchedlishvili ; O. Naviliat-Cuncic ; F. M. Piegsa ; G. Pignol ; P. N. Prashanth ; G. Quéméner ; D. Rebreyend ; D. Ries ; S. Roccia ; P. Schmidt-Wellenburg ; A. Schnabel ; N. Severijns ; J. Voigt ; A. Weis ; G. Wyszynski J. Zejma ; J. Zenner ; G. Zsigmond ;
Date:	11 Dec 2014
Abstract:	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 $^{199}$Hg atoms confined in the same volume. The measurement was performed in a $sim$1$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 $g_Sg_P$. 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.
Source:	arXiv, 1412.3679
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