History of exotic Meson (4-quark) and Baryon (5-quark) States

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.

14 pages Latex including 4 eps figures, final version to appear as a topical review in J. Phys. G

References in corpus (2)

• Interpretation of the Theta+ as an isotensor pentaquark with weakly decaying partners
• Time delayed K+ N reactions and exotic baryon resonances

Cited by in corpus (14)

• Exotic hadrons: review and perspectives
• The Status of Exotic-quantum-number Mesons
• Diquark and light four-quark states
• A Naturally Narrow Positive Parity Theta^+
• Exotic states of matter in heavy meson decays
• Antiproton physics
• Prospects for Pentaquark Production at Meson Factories
• A New Approach to Physics of Nuclei
• QCD Sum Rules Description of Nucleons in Asymmetric Nuclear Matter
• Phenomenology of spin 3/2 baryons with pentaquarks
• Tetraquark particle in the string model
• Structure and reactions of pentaquark baryons
• Non-Abelian dynamics and heavy multiquarks, Steiner-tree confinement in hadron spectroscopy
• Pentaquark Theta^+ production via gamma N ->K^*bar Theta^+(3/2^(+-))