This talk gives an overview of the recent results on the precision
spectroscopy of antiprotonic helium which was performed by the ASACUSA
collaboration at the Antiproton Decelerator of CERN. The laser spectroscopy of
energy levels of the antiproton has reached a relative accuracy of βΌ10β7, and by comparing the experimental value for the transition
wavelengths with theoretical calculations, a CPT test on the equality of proton
and antiproton charge and mass of <6Γ10β8 has been obtained. In a
recent experiment, the hyperfine structure of the (n,l)=(37,35) state of
antiprotonic helium has been measured for the first time with an accuracy of 3Γ10β5.Comment: Invited talk at the XIVth Rencontres de Blois on Matter-Antimatter
Asymmetry, Blois, June 200