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ics Colloquium
Friday, April 15, 2005
4:00 PM
Physics Building, Room 204
Note special time.
Marco Mirazita [Host: Simonetta Liuti]
INFN, Laboratori Nazionali di Frascati
"The Search For the Exotic 5 Quark Baryons"
All the well established particles can be classified using the constituent quark model as quark-antiquark states for mesons and 3-quarks states for baryons. However, QCD does not forbid the existence of more complicated internal structures. All the states with quark content different than quark-antiquark or 3-quarks are called "exotic". Exotic particles have been searched for many year in the past, but no positive results have been find until 2003, when several experimental groups reported the first evidences (even if with low statistical significance) for an exotic pentaquark state, the Theta+(1540). On the other hand, several other experiments did not find positive evidence for this state, thus suggesting that, if the Theta+ exists, it should be a really exotic particle. After these first experimental results, several laboratories planned new high-statistic experiments, such those performed and presently under analysis at Jefferson Laboratory. The aim of these experiments is first of all to confirm the existence of Theta+(1540), then to set in an unanmbiguous way its properties. In this talk, a review of the experimental situation will be given, and what we need to conclude that the first exotic baryon has been discovered will be discussed.

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