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• n  a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy

• A positron (the antiparticle associated with the electron) can be considered to be an electron going backward in time.
• Recent subatomic-physics research has disclosed the existence of an antiparticle for every particle of ordinary matter, he says, thus there is every reason to assume that half the .
• Once they got their huge, high-energy accelerators working in the late 1950s, they matched 16 of these bits of matter with their antiparticle mates.

News & Articles

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• Ghost particles: New limits on extremely rare decay
  Neutrinos are the most elusive particles having extremely weak interactions with all other particles. They have rather unusual properties and are even expected to be identical with their own antiparticles. So far this property is, however, not experimentally verified even though many studies of neutrinos over the last 60 years have already boosted our understanding of elementary particle physics ...
  July 17, 2013 - Science Daily