Why matter prevails over antimatter
Physicists working at the Fermilab Tevatron particle collider have offered clues as to why matter prevails over antimatter in the universe.
Washington: Physicists working at the Fermilab Tevatron particle collider have offered clues as to why matter prevails over antimatter in the universe.
They found that colliding protons in their experiment produced short-lived B meson particles that almost immediately broke down into debris that included slightly more matter than antimatter.
The two types of matter annihilate each other, so most of the material coming from these sorts of decays would disappear, leaving an excess of regular matter behind.
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.
Physicists have long known about processes described by current physics theory that would produce tiny excesses of matter, but the amounts the theories predict are far smaller than necessary to create the universe we observe.
The Tevatron experiments suggest that we are on the verge of accounting for the quantities of matter that exist today.
But the truly exciting implication is that the experiment implies that there is new physics, beyond the widely accepted Standard Model, that must be at work.
If that``s the case, major scientific developments lie ahead.
The results emerge from a complicated and challenging analysis, and have yet to be confirmed by other experiments.
The results are being published in the APS journals Physical Review Letters and Physical Review D.