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APS » Journals » Phys. Rev. Lett. » Volume 82 » Issue 16
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Phys. Rev. Lett. 82, 3198–3201 (1999)

Precision Mass Spectroscopy of the Antiproton and Proton Using Simultaneously Trapped Particles

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G. Gabrielse, A. Khabbaz, and D. S. Hall*
Department of Physics, Harvard University, Cambridge, Massachusetts 02138

C. Heimann and H. Kalinowsky
Institut für Strahlen- und Kernphysik, University of Bonn, 53115 Bonn, Germany

W. Jhe
Department of Physics, Seoul National University, 151-742 Seoul, Korea

Received 10 November 1998; published in the issue dated 19 April 1999

This last of a series of three measurements improves the comparison of antiproton (p̅ ) and proton (p) by almost a factor of 106 over earlier exotic atom measurements, and is the most precise CPT test with baryons by a similar large factor. Measuring the cyclotron frequencies of a simultaneously trapped p̅ and H- ion establishes that the ratio of q/m for p̅ and p is -0.99999999991±0.00000000009, more than 10 times the accuracy over our previous measurement. This 9×10-11 comparison makes the first use of simultaneously trapped particles for sub-ppb spectroscopy.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.3198
DOI:
10.1103/PhysRevLett.82.3198
PACS:
06.20.Jr, 11.30.Er, 14.20.Dh, 32.80.Pj

*Current address: CB440, JILA, Boulder, Colorado.

 
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