05-18-10, 12:22 PM #1
Question -- Anti-Particles imply Rest Mass ?
If photons (zero rest mass) have no anti-particle, do Particle / Anti-Particle pairs necessarily have rest mass ? For example, that Anti-Neutrinos exist demands that Neutrinos have rest mass ??
05-18-10, 01:04 PM #2
Gluons and photons need not have mass to be considered their own anti-particles.
Two photons can and do extinguish themselves to produce a pair of electromagnetically charged particles when the center-of-momentum energy is high enough. This is usually called pair production and not photon annihilation.
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