Antimatter

:For the physics of antimatter, see the article on antiparticles.

Notation

Physicists need a notation to distinguish particles from antiparticles. One way is to denote an antiparticle by adding a bar (or macron) over the symbol for the particle. For example, the proton and antiproton are denoted as mathrm{p}, and ar{mathrm{p}}, respectively.

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Another convention is to distinguish particles by their electric charge. Thus, the electron and positron are denoted simply as e− and e+. Adding a bar over the e+ symbol would be redundant and is not done.

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