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 shifts δν12 and δν34 to ν12 and ν34, 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 ν12 and ν34 at the Earth's sidereal frequency. No time dependence was found in ν12 or ν34 at the level of 20 Hz, limiting the size of some CPT and Lorentz-violating parameters at the level of 2×10-23 GeV.
Physical Review Letters
- Pub Date:
- September 2001
- High Energy Physics - Experiment;
- High Energy Physics - Phenomenology
- 4 pages, 4 figures, uses REVTeX and epsf, submitted to Phys. Rev. Lett