As recent article in NYT discusses new findings in the FermiLab – http://www.nytimes.com/2010/05/18/science/space/18cosmos.html?src=me&ref=general
The new effect hinges on the behavior of particularly strange particles called neutral B-mesons, which are famous for not being able to make up their minds. They oscillate back and forth trillions of times a second between their regular state and their antimatter state. As it happens, the mesons, created in the proton-antiproton collisions, seem to go from their antimatter state to their matter state more rapidly than they go the other way around, leading to an eventual preponderance of matter over antimatter of about 1 percent, when they decay to muons.
I could not find the relevant papers (that NYT referred to) in arxiv.org but many of the relevant papers are in the Web of Science database
** photo by http://www.flickr.com/photos/berkeleylab/
