Weizmann Institute of Science, Rehovot, Israel; Argonne
What does the Pentaquark
teach us about QCD and vice versa?
The experimental discovery of the Θ+ Pentaquark opens a new
chapter in hadron spectroscopy and may help in our understanding of how
hadrons are made from quarks and gluons. Theorists were surprised by
its different flavor structure from the anticharmed strange pentaquark
csuud predicted by the quark model to be the most favorable
pentaquark candidate. The difference has led to two-cluster models to
separate the pairs of identical flaver pairs whose short range
color-magnetic interaction is repulsive. Possible future experiments are
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