Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-01-25
Ann.Rev.Nucl.Part.Sci.58:51-73,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 7 figures. Review for Ann Rev Nucl & Part Sci
Scientific paper
10.1146/annurev.nucl.58.110707.1
Charmonium, the spectroscopy of c\bar{c} mesons, has recently enjoyed a renaissance with the discovery of several missing states and a number of unexpected charmonium-like resonances. The discovery of these new states has been made possible by the extremely large data samples made available by the B-factories at the Stanford Linear Accelerator Center and at KEK in Japan, and at the CESR e^+e^- collider at Cornell. Conventional c\bar{c} states are well described by quark potential models. However, many of these newly discovered charmonium-like mesons do not seem to fit into the conventional c\bar{c} spectrum. There is growing evidence that at least some of these new states are exotic, i.e. new forms of hadronic matter such as mesonic-molecules, tetraquarks, and/or hybrid mesons. In this review we describe expectations for the properties of conventional charmonium states and the predictions for molecules, tetraquarks and hybrids and the various processes that can be used to produce them. We examine the evidence for the new candidate exotic mesons, possible explanations, and experimental measurements that might shed further light on the nature these states.
Godfrey Stephen
Olsen Stephen Lars
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