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

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

2010-06-25

arxiv.org/abs/1006.4967v1

Europhys.Lett.92:51001,2010

Physics

Nuclear Physics

Nuclear Experiment

Submitted to Phys. Rev. Lett

Scientific paper

10.1209/0295-5075/92/51001

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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