Köln 2004 – wissenschaftliches Programm

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PV: Plenarvorträge

PV XXIII

PV XXIII: Plenarvortrag

Freitag, 12. März 2004, 09:00–09:30, P

Experimental evidence for pentaquarks — •Michael Ostrick — Physikalisches Institut Universitaet Bonn

Recently several experimental groups reported evidence for the formation and the (photo)–production of a narrow K⁺ n–resonance, the Θ⁺(1540). Such an object does not fit into the ordinary quark picture of hadrons, where baryons are understood in terms of three valence quarks and a sea of gluons and quark–anti-quark excitations. In order to account for its positive strangeness the Θ⁺ must have at least one anti–strange quark together with 4 quarks and is therefore called pentaquark.
The current status of experimental evidences for pentaquark states will be presented in the talk and open questions will be discussed.