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Matter and antimatter are thought to have existed in equal amounts at the beginning of the universe, but today the universe appears to be composed essentially of matter. By studying subtle differences in the behavior of particle and antiparticles, experiments at the LHC are seeking to cast light on this dominance of matter over antimatter.
Now the LHCb experiment has observed a preference for matter over antimatter known as CP-violation in the decay of neutral B0s particles, read more: http://home.web.cern.ch/about/updates/2013/04/lhcb-experiment-observes-new-matter-antimatter-difference
Credit: CERN Video Productions/CERNTV