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In Search of Antimatter in the Universe the Standard Model of Particles

In 1928, Paul Dirac predicted the existence of an ‘anti-electron’, a particle that had the same mass as an electron, but opposite charge; an antiparticle 1 . Today, under the Standard Model of particles (Figure 1), every particle has a corresponding antiparticle; protons have antiprotons, neutrons have antineutrons, and so on. Each antiparticle has the same mass, but opposite charge of the ‘normal’ particle. Perhaps the most mystifying feature of this relationship is the complete annihilation that occurs whenever a particle and its corresponding antiparticle collide. The Standard Model of