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We review the current status of the exotic pentaquark baryons. After a brieflook at experiments of both positive and negative results, we discusstheoretical methods to study the structure and reactions for the pentaquarks.First we introduce the quark model and the chiral soliton model, where wediscuss the relation of mass spectrum and parity with some emphasis on the roleof chiral symmetry. It is always useful to picture the structure of thepentaquarks in terms of quarks. As for other methods, we discuss a modelindependent method, and briefly mention the results from the lattice and QCDsum rule. Decay properties are then studied in some detail, which is one of theimportant properties of Theta+. We investigate the relation between the decaywidth and the quark structure having certain spin-parity quantum numbers.Through these analyses, we consider as plausible quantum numbers of Theta+, JP= 3/2-. In the last part of this note, we discuss production reactions ofTheta+ which provide links between the theoretical models and experimentalinformation. We discuss photoproductions and hadron-induced reactions which areuseful to explore the nature of Theta+Comment: 20 pages, proceedings for the workshop on HADRON PHYSICS, March 7 -  17, (2005) Puri, Indi

Structure and reactions of pentaquark baryons