History of exotic meson (four-quark) and baryon (five-quark) states

21 January 2004

journal article
Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics

Vol. 30 (3) , R113-R121
https://doi.org/10.1088/0954-3899/30/3/r02

Abstract

I briefly review the history of exotic meson (4-quark) and baryon (5-quark) states, which is rooted in the formalism of Regge pole and duality. There are robust model-independent predictions for the exchange of 4-quark (Baryonium) Regge trajectories in several processes, which are strongly supported by experiment. On the other hand the predictions for the spectroscopy of 4-quark resonances are based on specific QCD inspired models, with some experimental support. The corresponding predictions for the recently discovered exotic baryon (Pentaquark) state are briefly discussed.

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