Determination of the Antiproton-to-Electron Mass Ratio by Precision Laser Spectroscopy of p¯He+

M. Hori, A. Dax, J. Eades, K. Gomikawa, R. S. Hayano, N. Ono, W. Pirkl, E. Widmann, H. A. Torii, B. Juhász, D. Barna, and D. Horváth
Phys. Rev. Lett. 96, 243401 – Published 19 June 2006

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 (916)×109. 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 Mp¯/me=1836.152674(5).

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  • Received 10 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.96.243401

©2006 American Physical Society

Authors & Affiliations

M. Hori1,2, A. Dax2, J. Eades2, K. Gomikawa2, R. S. Hayano2, N. Ono2, W. Pirkl2, E. Widmann3, H. A. Torii4, B. Juhász5,3, D. Barna6,2, and D. Horváth6

  • 1CERN, CH-1211 Geneva 23, Switzerland
  • 2Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 3Stefan Meyer Institut für Subatomare Physik, Boltzmanngasse 3, Vienna 1090, Austria
  • 4Institute of Physics, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan
  • 5Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary
  • 6KFKI Research Institute for Particle and Nuclear Physics, H-1525 Budapest, Hungary

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Issue

Vol. 96, Iss. 24 — 23 June 2006

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