High Quality Content by WIKIPEDIA articles! The Y(4140) particle is a previously unpredicted particle observed at Fermilab and announced on 17 March 2009. This particle is extremely rare and was detected in only 20 of billions of collisions. Because it decays into J/? and ? mesons, it has been suggested that this particle is composed of charm quarks and charm antiquarks, possibly even a four quark combination. Fermi National Accelerator Laboratory (Fermilab), located in Batavia near Chicago, Illinois, is a US Department of Energy national laboratory specializing in high-energy particle physics. As of January 1, 2007, Fermilab is operated by the Fermi Research Alliance, a joint venture of the University of Chicago and the Universities Research Association (URA). Fermilab is a part of the Illinois Technology and Research Corridor.

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