Question -- Anti-Particles imply Rest Mass ?

Discussion in 'Physics & Math' started by Widdekind, May 18, 2010.

  1. Widdekind Registered Member

    Messages:
    1
    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 ??
     
  2. rpenner Fully Wired Valued Senior Member

    Messages:
    3,164
    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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