Limit on Lorentz andCPTViolation of the Neutron Using a Two-Species Noble-Gas Maser

Abstract

A search for sidereal variations in the frequency difference between co-located ${}^{129}\mathrm{Xe}$ and ${}^3\mathrm{He}$ Zeeman masers sets the most stringent limit to date on leading-order Lorentz and CPT violation involving the neutron, consistent with no effect at the level of ${10}^{-31\mathrm{}}\mathrm{GeV}$.