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Phys. Rev. Lett. 96, 243401 (2006) [4 pages]

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

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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

Received 10 April 2006; published 19 June 2006

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 Mp̅ /me=1836.152 674(5).

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.243401
DOI:
10.1103/PhysRevLett.96.243401
PACS:
36.10.−k, 06.20.Dk, 14.20.Dh, 32.70.Jz
 
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