![]() Glashow is quoted as saying, "We called our construct the 'charmed quark', for we were fascinated and pleased by the symmetry it brought to the subnuclear world." The first charmed particle (a particle containing a charm quark) to be discovered was the J/ψ meson. ![]() The existence of a fourth quark had been speculated by a number of authors around 1964 (for instance by James Bjorken and Sheldon Glashow ), but its prediction is usually credited to Sheldon Glashow, John Iliopoulos and Luciano Maiani in 1970 (see GIM mechanism). ![]() The antiparticle of the charm quark is the charm antiquark (sometimes called anticharm quark or simply anticharm), which differs from it only in that some of its properties have equal magnitude but opposite sign. Like all quarks, the charm quark is an elementary fermion with spin 1 / 2, and experiences all four fundamental interactions: gravitation, electromagnetism, weak interactions, and strong interactions. It, along with the strange quark, is part of the second generation of matter, and has an electric charge of + 2 / 3 e and a bare mass of 1.275 +0.025 Examples of hadrons containing charm quarks include the J/ψ meson ( Charm quarks are found in hadrons, which are subatomic particles made of quarks. The charm quark, charmed quark or c quark (from its symbol, c) is the third-most massive of all quarks, a type of elementary particle.
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