antiparticle

• anti-particle

anti- +‎ particle

• IPA^(key): /ˈæntiˌpɑɹtɪkəl/

antiparticle (plural antiparticles)

1. (physics) A subatomic particle corresponding to another particle with the same mass, spin and mean lifetime but with charge, parity, strangeness and other quantum numbers flipped in sign; a particle that has a reversed world line to another.
   • 1988, Stephen Hawking, A Brief History of Time: From the Big Bang to Black Holes, page 75:

     There could be whole antiworlds and antipeople made out of antiparticles. However, if you meet your antiself, don't shake hands!

   • 2010 November 19, Alok Jha, “We can't see antimatter but it really does matter”, in The Guardian‎, →ISSN:

     Particles of matter and antimatter are identical, except for an opposite electrical charge. An electron has a negative charge whereas its antiparticle, the positron, has a positive charge, and both have an identical mass.

• The symbol for an antiparticle is the symbol for the normal particle plus "bar" (e.g. pbar) or with a bar above the symbol.

• antimatter
• self-conjugate