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Spectroscopy with Heavy Quark Symmetry
In 1989 a hidden symmetry of the strong interactions was discovered(1): as the mass of a quark in a strongly interacting system becomes large, its interactions become independent of the mass and spin of that quark. "Spectroscopy with Heavy Quark Symmetry" was the first paper to describe the implications of this discovery for the spectrum of particles containing a single heavy quark.
(1) N. Isgur and M.B. Wise, Phys. Lett. B 232, 113 (1989); 237, 527 (1990).
Nathan Isgur
Jefferson Lab
April 1999