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

Masaki Hori (), Anna Sótér, Daniel Barna, Andreas Dax, Ryugo Hayano, Susanne Friedreich, Bertalan Juhász, Thomas Pask, Eberhard Widmann, Dezső Horváth, Luca Venturelli and Nicola Zurlo
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Masaki Hori: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1
Anna Sótér: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1
Daniel Barna: University of Tokyo, Hongo, Bunkyo-ku
Andreas Dax: University of Tokyo, Hongo, Bunkyo-ku
Ryugo Hayano: University of Tokyo, Hongo, Bunkyo-ku
Susanne Friedreich: Stefan Meyer Institut für Subatomare Physik, Boltzmanngasse 3
Bertalan Juhász: Stefan Meyer Institut für Subatomare Physik, Boltzmanngasse 3
Thomas Pask: Stefan Meyer Institut für Subatomare Physik, Boltzmanngasse 3
Eberhard Widmann: Stefan Meyer Institut für Subatomare Physik, Boltzmanngasse 3
Dezső Horváth: KFKI Research Institute for Particle and Nuclear Physics
Luca Venturelli: Università di Brescia & Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia
Nicola Zurlo: Università di Brescia & Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Brescia

Nature, 2011, vol. 475, issue 7357, 484-488

Abstract: CPT symmetry upheld The principle of CPT (charge, parity, time) symmetry implies that antimatter particles have exactly the same mass and absolute value of charge as their particle counterparts. Hori et al. test this principle by performing high-precision, two-photon spectroscopy of antiprotonic helium. By comparing the results with calculations, they derive a value for the antiproton-to-electron mass ratio, the first time this quantity has been determined. The result agrees with the proton-to-electron value known to a similar precision. Moreover, the work improves the accuracy with which the charge-to-mass ratio of the antiproton can be compared to that of the proton by four orders of magnitude.

Date: 2011
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DOI: 10.1038/nature10260

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