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Bound on Lorentz- and CPT-Violating Boost Effects for the Neutron

F. Canè·D. Bear·D. F. Phillips·M. S. Rosen·C. L. Smallwood·R. E. Stoner·R. L. Walsworth·V. Alan Kostelecký
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Abstract

A search for an annual variation of a daily sidereal modulation of the frequency difference between co-located ${}^{129}$Xe and ${}^{3}$He Zeeman masers sets a stringent limit on boost-dependent Lorentz and CPT violation involving the neutron, consistent with no effect at the level of 150 nHz. In the framework of the general Standard-Model Extension, the present result provides the first clean test for the fermion sector of the symmetry of spacetime under boost transformations at a level of $10^{-27}$ GeV.

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F. Canè, D. Bear, D. F. Phillips, M. S. Rosen, C. L. Smallwood, R. E. Stoner, R. L. Walsworth, V. Alan Kostelecký. 2004-10-28. Bound on Lorentz- and CPT-Violating Boost Effects for the Neutron. https://doi.org/10.1103/physrevlett.93.230801

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