Following a suggestion from Kostelecký et al., we evaluated a test of CPT and Lorentz invariance from the microwave spectroscopy of muonium. Hamiltonian terms beyond the standard model violating CPT and Lorentz invariance would contribute frequency shiftsδν12 and δν34toδν12and δν34, the two transitions involving muon spin flip, which were precisely measured in ground state muonium in a strong magnetic field of 1.7 T. The shifts would be indicated by anticorrelated oscillations in δν12and δν34at the Earth's sidereal frequency. No time dependence was found in δν12and δν34at the level of 20 Hz, limiting the size of some CPT and Lorentz-violating parameters at the level of 2 ×10−23GeV.
ASJC Scopus subject areas
- Physics and Astronomy(all)