Positrons are an example of, for 10 points, this class of particles which undergo annihilation when combined with their regular counterparts due to having equal mass but opposite charges.
Leonard Schiff and Myron Good argued these entities would violate the Eotvos experiment and CPT symmetry. The hydrogen varieties of these entities have been experimented with by ATRAP, ATHENA, and ALPHA. The 1959 Nobel Physics Prize was awarded to Owen Chamberlain and Emilio Segre for using the Bevatron to discover a variety of these entities. Paul Dirac hypothesized the hole theory to explain these particles. Positrons are an example of, for 10 points, this class of particles which undergo annihilation when combined with their regular counterparts due to having equal mass but opposite charges.
Leonard Schiff and Myron Good argued these entities would violate the Eotvos experiment and CPT symmetry.
{antiparticles} [or {antimatter}]