Measurement of The Mass Ratio Between The Antiproton and Electron
By measuring the particular frequency of the laser light needed to resonate the atom, the ASACUSA experiment determined the mass of the antiproton, which they measured at 1,836.1536736(23) times more massive than an electron. This is the same as the mass of a "regular" proton, within the level of certainty of the experiment. This is a confirmation of a fundamental symmetry of nature called CPT (short for Charge, Parity, and Time reversal). This law says that all physical laws would appear the same if you simultaneously reversed the charge, parity, and the flow of time (or equivalently, the direction of motion) in the universe. One of the important predictions of this theory is that particles and their antiparticles should have exactly the same mass.
Read more about this topic: Antiprotonic Helium
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