Limit on Lorentz andCPTviolation of the proton using a hydrogen maser
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields2001Vol. 63(11)
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David F. Phillips, M. A. Humphrey, E. M. Mattison, R. E. Stoner, R. F. C. Vessot, Ronald L. Walsworth
Abstract
We present a new measurement constraining Lorentz and $\mathrm{CPT}$ violation of the proton using a hydrogen maser double resonance technique. A search for hydrogen Zeeman frequency variations with a period of the sidereal day (23.93 h) sets a limit on violation of Lorentz and $\mathrm{CPT}$ symmetry of the proton at the ${10}^{\ensuremath{-}27}$ GeV level, independent of nuclear model uncertainty, which improves significantly on previous bounds.
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