The antiparticle of the electron. Discovered by Anderson in 1931.
Identical to the electron in atomic mass, theoretical rest mass, and energy, but opposite in sign.
- Short lived and can exist only when in motion.
- On combination with an electron, both particles are annihilated and two photons result, equal in energy to the combined masses of the annihilated particles.
- Production can only occur in pair formation with the electron, the inverse of the annihilation process.