Antiprotonic Helium — A Window into the Antiworld

  • R. S. Hayano
Conference paper
Part of the Few-Body Systems book series (FEWBODY, volume 12)


The antiprotonic helium,\(\overline p e\overline {} H{e^{2 + }} \equiv \overline p H{e^ + }\), first discovered at KEK and studied in detail at LEAR, is a unique metastable existence interfacing be- tween matter and antimatter. Our recent high-resolution laser spectroscopy of \(\overline p H{e^ + }\) has reached a precision of 0.5 ppm, and the agreement between our ex- perimental values of transition energies and the calculations has become better than 1 ppm. This agreement in turn sets a severe constraint on the antiproton charge and mass. Future possibilities at the new antiproton decelerator (AD) are also discussed.


Helium Atom Lamb Shift Antiprotonic Helium Antiproton Decelerator Antiprotonic Helium Atom 
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Copyright information

© Springer-Verlag Wien 2000

Authors and Affiliations

  • R. S. Hayano
    • 1
  1. 1.Department of PhysicsUniversity of TokyoBunkyo-ku, TokyoJapan

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