SCIENCE - One step closer: Scientists help explain scarcity of anti-matter

A collaboration with major participation by physicists at the University of Wisconsin-Madison has made a precise measurement of elusive, nearly massless particles, and obtained a crucial hint as to why the universe is dominated by matter, not by its close relative, anti-matter.

http://phys.org/news/2012-12-closer-scientists-scarcity-anti-matter.ht