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The charm quark is a second-generation quark with a charge of +(2/3)e. It is the third most massive of the quarks, at 1.3 GeV (a bit more than the mass of the proton). It was predicted in 1970 by Sheldon Glashow, John Iliopoulos, and Luciano Maiani, and first observed in November 1974, with the simultaneous discovery of the J/ψ charm particle at SLAC (Stanford Linear Accererator Center) by a group led by Burton Richter and at BNL (Brookhaven National Laboratory) by a group led by Samuel C. C. Ting. The particle was named J by the BNL group and ψ by the SLAC group; when the naming controversy could not be resolved, the compromise J/ψ was adopted.
Additional recommended knowledge
Hadrons containing charm quarks
Some of the hadrons containing charm quarks include:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Charm_quark". A list of authors is available in Wikipedia.|