Harry Lipkin

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 suggested.

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