Determination of the antiproton-to-electron mass ratio by precision laser spectroscopy of p̄He+

M. Hori, A. Dax, J. Eades, K. Gomikawa, R. S. Hayano, N. Ono, W. Pirkl, E. Widmann, H. A. Torii, B. Juhász, D. Barna, D. Horváth

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Abstract

A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of (9-16)×10-9. One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to-electron mass ratio of Mp̄/me=1836.152674(5).

Original languageEnglish
Article number243401
JournalPhysical review letters
Volume96
Issue number24
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Hori, M., Dax, A., Eades, J., Gomikawa, K., Hayano, R. S., Ono, N., Pirkl, W., Widmann, E., Torii, H. A., Juhász, B., Barna, D., & Horváth, D. (2006). Determination of the antiproton-to-electron mass ratio by precision laser spectroscopy of p̄He+. Physical review letters, 96(24), [243401]. https://doi.org/10.1103/PhysRevLett.96.243401