Video News Release ALPHA experiment

Antimatter continues to intrigue physicists due to its apparent absence in the observable universe. Current theory requires that matter and antimatter should have appeared in equal quantities after the Big Bang, but the Stan- dard Model offers no quantitative explanation for the apparent disappearance of half of the universe. It has recently become possible to study trapped atoms1–4 of antihydrogen to search for possible, as yet unobserved, differences in the physical behaviour of matter and antimatter.