EPJ Web of Conferences (Mar 2014)

Antiproton–to–electron mass ratio determined by two-photon laser spectroscopy of antiprotonic helium atoms

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

DOI
https://doi.org/10.1051/epjconf/20146605020
Journal volume & issue
Vol. 66
p. 05020

Abstract

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The ASACUSA collaboration of CERN has recently carried out two-photon laser spectroscopy of antiprotonic helium atoms. Three transition frequencies were determined with fractional precisions of 2.3–5 parts in 109. By comparing the results with three-body QED calculations, the antiproton-to-electron mass ratio was determined as 1836.1526736(23).