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Hori M, Eades J, Hayano RS, et al. Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass. Phys Rev Lett. 2001;87(9):093401doi: 10.1103/PhysRevLett.87.093401.
Hori, M., Eades, J., Hayano, R. S., Ishikawa, T., Sakaguchi, J., Widmann, E., Yamaguchi, H., Torii, H. A., Juhász, B., Horváth, D., & Yamazaki, T. (2001). Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass. Physical review letters, 87(9), 093401. https://doi.org/10.1103/PhysRevLett.87.093401
Hori, M, et al. "Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass." Physical review letters vol. 87,9 (2001): 093401. doi: https://doi.org/10.1103/PhysRevLett.87.093401
Hori M, Eades J, Hayano RS, Ishikawa T, Sakaguchi J, Widmann E, Yamaguchi H, Torii HA, Juhász B, Horváth D, Yamazaki T. Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass. Phys Rev Lett. 2001 Aug 27;87(9):093401. doi: 10.1103/PhysRevLett.87.093401. Epub 2001 Aug 09. PMID: 11531565.
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Phys Rev Lett. 2001 Aug 27;87(9):093401. doi: 10.1103/PhysRevLett.87.093401. Epub 2001 Aug 09.

Sub-ppm laser spectroscopy of antiprotonic helium and a CPT-violation limit on the antiprotonic charge and mass.

Physical review letters

M Hori, J Eades, R S Hayano, T Ishikawa, J Sakaguchi, E Widmann, H Yamaguchi, H A Torii, B Juhász, D Horváth, T Yamazaki

Affiliations

  1. CERN, CH-1211 Geneva 23, Switzerland.

PMID: 11531565 DOI: 10.1103/PhysRevLett.87.093401

Abstract

Six laser-resonant transitions have been detected in metastable antiprotonic helium atoms produced at the CERN Antiproton Decelerator. They include UV transitions from the last metastable states in the v = n-l-1 = 0 and 1 cascades. Zero-density frequencies were obtained from measured pressure shifts with fractional precisions between 1.3 x 10(-7) and 1.6 x 10(-6). By comparing these with QED calculations and the antiproton cyclotron frequency, we deduce that the antiproton and proton charges and masses agree to within 6 x 10(-8) with a confidence level of 90%.

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