Abstract
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 and to and , 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 and at the Earth’s sidereal frequency. No time dependence was found in or at the level of 20 Hz, limiting the size of some CPT and Lorentz-violating parameters at the level of .
- Received 4 May 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.111804
©2001 American Physical Society