Matter vs Antimatter
Posted on Sep 4 2011 at 06:03:55 AM in Astronomy
A large collaboration of physicists working at the Fermilab Tevatron particle collider in the USA has found evidence for a possible explanation for the prevalence of matter over antimatter in the universe.
They found that smashing protons together in their experiment produced short-lived particles called “B mesons” that almost immediately broke down into debris that included slightly more matter than antimatter.
When particles of matter and antimatter collide, they annihilate each other and release energy. If there is slightly more matter to begin with, then all the antimatter will be annihilated, leaving a small excess of matter.
This sort of matter/antimatter asymmetry accounts for the fact that just about all the material in the universe is made of the normal matter we’re familiar with.
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