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arXiv · hep-ex/0106103

Test of CPT and Lorentz invariance from muonium spectroscopy

V. W. Hughes·M. Grosse Perdekamp·D. Kawall·W. Liu·K. Jungmann·G. zu Putlitz
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Abstract

Following a suggestion of Kostelecky et al. we have 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 $δν_{12}$ and $δν_{34}$ to $ν_{12}$ and $ν_{34}$, 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 anti-correlated oscillations in $ν_{12}$ and $ν_{34}$ at the earth's sidereal frequency. No time dependence was found in $ν_{12}$ or $ν_{34}$ at the level of 20 Hz, limiting the size of some CPT and Lorentz violating parameters at the level of $2\times10^{-23}$ GeV, representing Planck scale sensitivity and an order of magnitude improvement in sensitivity over previous limits for the muon.

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V. W. Hughes, M. Grosse Perdekamp, D. Kawall, W. Liu, K. Jungmann, G. zu Putlitz. 2001-06-29. Test of CPT and Lorentz invariance from muonium spectroscopy. https://doi.org/10.1103/physrevlett.87.111804

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