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New Limit on Lorentz- and C P T -Violating Neutron Spin Interactions

2010; American Physical Society; Volume: 105; Issue: 15 Linguagem: Inglês

10.1103/physrevlett.105.151604

1092-0145

Justin M. Brown, Sylvia Smullin, T. W. Kornack, Michael Romalis,

Advanced NMR Techniques and Applications

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 ³He atoms. The comagnetometer 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 b˜Xn=(0.1 ± 1.6) × 10⁻³³ GeV and b˜Yn=(2.5 ± 1.6) × 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.