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arXiv · 1006.5425

New limit on Lorentz and CPT-violating neutron spin interactions

J. M. Brown·S. J. Smullin·T. W. Kornack·M. V. Romalis
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Abstract

We performed a search for neutron spin coupling to a Lorentz and CPT-violating background field using a magnetometer with overlapping ensembles of K and $^3$He atoms. The co-magnetometer is mounted on a rotary platform for frequent reversal of its orientation. We measure sidereal oscillations in the signal to search for anomalous spin coupling of extra-solar origin. We determine the equatorial components of the background field interacting with the neutron spin to be $\widetilde{b}^n_X = (0.1 \pm 1.6) \times 10^{-33}$ GeV and $\widetilde{b}^n_Y = (2.5 \pm 1.6) \times 10^{-33}$ GeV, improving on the previous limit by a factor of 30. This measurement represents the highest energy resolution of any spin anisotropy experiment.

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J. M. Brown, S. J. Smullin, T. W. Kornack, M. V. Romalis. 2010-06-28. New limit on Lorentz and CPT-violating neutron spin interactions. https://doi.org/10.1103/physrevlett.105.151604

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