Precise laser spectroscopy of the antiprotonic helium atom and CPT test on antiproton mass and charge

We have measured twelve transition frequencies of the antiprotonic helium atom (p̄He +) with precisions of 0.1–0.2 ppm using a laser spectroscopic method. The agreement between the experiment and theories was so good that we can put a limit on the proton-antiproton mass (or charge) difference. The n...

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Bibliographic Details
Published in:Nuclear physics. A 2003-06, Vol.721, p.C473-C476
Main Authors: Yamaguchi, H., Eades, J., Hayano, R.S., Hori, M., Horváth, D., Ishikawa, T., Juhász, B., Sakaguchi, J., Torii, H.A., Widmann, E., Yamazaki, T.
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Language:English
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Summary:We have measured twelve transition frequencies of the antiprotonic helium atom (p̄He +) with precisions of 0.1–0.2 ppm using a laser spectroscopic method. The agreement between the experiment and theories was so good that we can put a limit on the proton-antiproton mass (or charge) difference. The new limit is expected to be much smaller than the already published value, 60 ppb (6 × 10 −8).
ISSN:0375-9474
DOI:10.1016/S0375-9474(03)01102-3