Scientists Ponder Universe’s Missing Antimatter

Why is the universe dominated by matter? It is among the most perplexing questions to face particle physicists, scientists who study the tiniest building blocks of the universe.

Theories of physics require that for every particle of matter created at the big bang–the cosmic explosion that marked the beginning of the universe–so too was its antiparticle equivalent, or antimatter, said Persis Drell, a particle physicist at the Stanford Linear Accelerator Center (SLAC) in Menlo Park, California.