Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-07
Phys.Rept.409:1-45,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
Abstract and Introduction modified for publication in Physics Reports. Typographical corrections. 34 pages, 14 figures, 4 tabl
Scientific paper
10.1016/j.physrep.2004.11.005
The first evidence for Quantum Chromodynamics (QCD), the theory of the strong interactions, came from the systematics of baryon and meson spectroscopy. An important early observation was the apparent absence of exotics, baryons requiring more than three quarks or mesons requiring more than quark-antiquark. Years later, QCD is well established, hadron spectroscopy has been relatively inactive, but the absence of exotics remains poorly understood. The recent observation of narrow, prominent exotic baryons has stirred up new interest in hadron spectroscopy. At present the experimental situation is confused; so is theory. The recent discoveries are striking. So too is the complete absence of exotic mesons, and, except for the recent discoveries, of exotic baryons as well. Whether or not the new states are confirmed, the way we look at complicated states of confined quarks and gluons has changed. Perhaps the most lasting result, and the one emphasized in these notes, is a new appreciation for the role of diquark correlations in QCD.
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