Light Meson Spectroscopy

Abstract

We survey the current status of light meson spectroscopy. We begin with a general introduction to meson spectroscopy and and its importance in understanding the physical states of Quantum Chromo Dynamics (QCD). Phemenological models of hadron spectroscopy are described with particular emphasis on the constituent quark model and the qualitative features it predicts for the meson spectrum. We next discuss expectations for hadrons lying outside the quark model, such as hadron states with excited gluonic degrees of freedom. These states include so-called hybrids glueballs}, as well as multiquark states. The established meson states are compared to the quark model predictions and we find that most meson states are well described by the quark model. However, a number of states in the light-quark sector do not fit in well, suggesting the existence of hadronic states with additional degrees of freedom. We end with a brief description of future directions in meson spectroscopy.

111 pages with 28 imbedded figures, in LaTeX2e with no special macros. Submitted to Reviews of Modern Physics, Nov.12, 1998

References in corpus (8)

• First Observation of PHI(1020)--->PI0+PI0+GAMMA Decay
• Evidence of the PHI(1020)--->ETA+PI0+GAMMA Decay
• A study of the centrally produced phiphi system in pp interactions at 450 GeV/c
• Interpretation of Experimental J^PC Exotic Signals
• Scalar Glueball Mixing and Decay
• Observation of the decay PHI(1020)--->OMEGA+PI0
• Further Search for the Two-Photon Production of the Glueball Candidate $f_J(2220)$
• D-wave heavy quarkonium production in fixed target experiments

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