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

H. Yamaguchi·J. Eades·R. S. Hayano·M. Hori·D. Horvath·T. Ishikawa·B. Juhasz·J. Sakaguchi·H. A. Torii·E. Widmann·T. Yamazaki
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Abstract

We have measured twelve transition frequencies of the antiprotonic helium atom (pbar-He+) 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.

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H. Yamaguchi, J. Eades, R. S. Hayano, M. Hori, D. Horvath, T. Ishikawa, B. Juhasz, J. Sakaguchi, H. A. Torii, E. Widmann, T. Yamazaki. 2003-03-19. Precise laser spectroscopy of the antiprotonic helium atom and CPT test on antiproton mass and charge. https://doi.org/10.1016/s0375-9474(03)01102-3

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