Two-photon laser spectroscopy of antiprotonic helium and the antiproton-electron mass ratio

D. Barna, M. Hori, A. Sótér, A. Dax, R. Hayano, S. Friedreich, B. Juhász, T. Pask, E. Widmann, D. Horváth, L. Venturelli, N. Zurlo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report our latest results from our two-photon spectroscopy of antiprotonic helium (a bound state of a helium nucleus, an electron and an antiproton). By measuring three transition frequencies with a precision of 2.3-5×10-9 and comparing these to 3-body QED calculations, we derived the antiproton-electron mass ratio 1,836.1526736(23),which agrees with the proton-electron mass ratio (known to a three-times better precision) within the errors. Since the (anti)proton's atomic mass is known to a better precision than that of the electron, assuming m̄p = mp this result can be used to determine the electron's atomic mass as m e=0.0005485799091(7) u.

Original languageEnglish
Title of host publication11th Conference on the Intersections of Particle and Nuclear Physics, CIPANP 2012
Pages142-144
Number of pages3
DOIs
Publication statusPublished - Dec 16 2013
Event11th Conference on the Intersections of Particle and Nuclear Physics, CIPANP 2012 - St. Petersburg, FL, United States
Duration: May 29 2012Jun 3 2012

Publication series

NameAIP Conference Proceedings
Volume1560
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other11th Conference on the Intersections of Particle and Nuclear Physics, CIPANP 2012
CountryUnited States
CitySt. Petersburg, FL
Period5/29/126/3/12

Keywords

  • antiproton-electron mass ratio
  • antiprotonic helium

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Barna, D., Hori, M., Sótér, A., Dax, A., Hayano, R., Friedreich, S., Juhász, B., Pask, T., Widmann, E., Horváth, D., Venturelli, L., & Zurlo, N. (2013). Two-photon laser spectroscopy of antiprotonic helium and the antiproton-electron mass ratio. In 11th Conference on the Intersections of Particle and Nuclear Physics, CIPANP 2012 (pp. 142-144). (AIP Conference Proceedings; Vol. 1560). https://doi.org/10.1063/1.4826739