arXiv:physics/0008230·v1·Atomic Physics
Limit on Lorentz and CPT Violation of the Proton Using a Hydrogen Maser
D. F. Phillips🇺🇸 · M. A. Humphrey🇺🇸 · E. M. Mattison🇺🇸 · R. E. Stoner🇺🇸 · R. F C. Vessot🇺🇸 · R. L. Walsworth🇺🇸
Abstract
We present a new measurement constraining Lorentz and 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 clean limit on violation of Lorentz and CPT symmetry of the proton at the 10^{-27} GeV level.
Comments: 4 pages, 3 figures. Submitted to Physical Review Letters