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Friday, April 15, 2005
Physics Building, Room 204
Note special time.
[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
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
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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