The most accurate measurement yet of the mass of the antiproton - the antimatter counterpart of the proton - has been announced by the ASACUSA collaboration. Japanese and European physicists joined forces at the antiproton decelerator at CERN to establish that the proton and antiproton charges and masses agree to within six parts in 100 million (M Hori et al 2001 Phys. Rev. Lett. to appear).
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