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arxiv: 1006.4967 · v1 · pith:KS4O7PDGnew · submitted 2010-06-25 · ⚛️ nucl-ex

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

I. Altarev , C. A. Baker , G. Ban , K. Bodek , M. Daum , M. Fertl , B. Franke , P. Fierlinger
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P. Geltenbort K. Green M. G. D. van der Grinten P. G. Harris R. Henneck M. Horras P. Iaydjiev S. N. Ivanov N. Khomutov K. Kirch S. Kistryn A. Knecht A. Kozela F. Kuchler B. Lauss T. Lefort Y. Lemi\`ere A. Mtchedlishvili O. Naviliat-Cuncic J. M. Pendlebury G. Petzoldt E. Pierre F. M. Piegsa G. Pignol G. Qu\'em\'ener D. Rebreyend S. Roccia P. Schmidt-Wellenburg N. Severijns D. Shiers K. F. Smith Yu. Sobolev J. Zejma J. Zenner G. Zsigmond
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keywords lorentzdipoleelectricinvariancemodulationmomentnedmneutron
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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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