Bound on Lorentz- and CPT-Violating Boost Effects for the Neutron
Abstract
A search for an annual variation of a daily sidereal modulation of the frequency difference between co-located 129Xe and 3He 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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