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26 April 2024

» arxiv » 0912.2175

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Search for macroscopic CP violating forces using a neutron EDM spectrometer
A. P. Serebrov ; O. Zimmer ; P. Geltenbort ; A. K. Fomin ; S. N. Ivanov ; E. A. Kolomensky ; I. A. Krasnoshekova ; M. S. Lasakov ; V. M. Lobashev ; A. N. Pirozhkov ; V. E. Varlamov ; A. V. Vasiliev ; O. M. Zherebtsov ; E. B. Aleksandrov ; S. P. Dmitriev ; N. A. Dovator ;
Date:	11 Dec 2009
Abstract:	The search for CP violating forces between nucleons in the so-called axion window of force ranges lam between 2x10^-5 m and 0.02 m is interesting because only little experimental information is available there. Axion-like particles would induce a pseudo-magnetic field for neutrons close to bulk matter. A laboratory search investigates neutron spin precession close to a heavy mirror using ultracold neutrons in a magnetic resonance spectrometer. From the absence of a shift of the magnetic resonance we established new constraints on the coupling strength of axion-like particles in terms of the product gs x gp of scalar and pseudo-scalar dimensionless constants, as a function of the force range lam, gs x gp x lam^2 <= 2x10-21 [cm^2] (C.L.95%) for 10^-4 cm < lam < 1 cm. For 0.1 cm < lam < 1 cm previous limits are improved by 4 to 5 orders of magnitude.
Source:	arXiv, 0912.2175
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