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New constraints on Lorentz invariance violation from the neutron electric dipole moment

Abstract : We propose an original test of Lorentz invariance in the interaction between a particle spin and an electromagnetic field and report on a first measurement using ultracold neutrons. We used a high sensitivity neutron electric dipole moment (nEDM) spectrometer and searched for a direction dependence of a nEDM signal leading to a modulation of its magnitude at periods of 12 and 24 hours. We constrain such a modulation to $d_{12} < 15 \times 10^{-25} \ e\,{\rm cm}$ and $d_{24} < 10 \times 10^{-25} \ e\,{\rm cm}$ at 95~\% C.L. The result translates into a limit on the energy scale for this type of Lorentz violation effect at the level of ${\cal E}_{LV} > 10^{10}$~GeV.
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http://hal.in2p3.fr/in2p3-00495497
Contributor : Emmanuelle Vernay <>
Submitted on : Monday, June 28, 2010 - 8:38:00 AM
Last modification on : Friday, April 3, 2020 - 11:18:46 AM

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I. Altarev, C. A. Baker, G. Ban, K. Bodek, M. Daum, et al.. New constraints on Lorentz invariance violation from the neutron electric dipole moment. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2010, 92, pp.51001. ⟨10.1209/0295-5075/92/51001⟩. ⟨in2p3-00495497⟩

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