Comparison of Antiproton and Proton Masses and Charges
By comparing the above results on laser spectroscopy of antiprotonic helium with separate high-precision measurements of the antiproton's cyclotron frequency carried out by the ATRAP collaboration at CERN, the mass and electric charge of the antiproton can be precisely compared with the proton values. The most recent such measurements show that the antiproton's mass (and the absolute value of the charge) is the same as the proton's to a precision of 0.7 parts in a billion.
Read more about this topic: Antiprotonic Helium
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