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DESCRIPTION:Wouter Deconinck\, University of Michigan\n\nIn 2003 new experi
mental evidence was presented for the observation of the exotic baryon
20 + (1540) with a minimal quark content $uuddar{s}$. Quickl
y more than ten nuclear and high energy physics experiments reported posit
ive results\, apparently confirming the existence of the Θ + (1540)\, but all suffered from low statistical precision. An increasin
g number of null results started to appear\, seemingly in contradiction wi
th the positive sightings. Now the null results dominate the positive res
ults\, often with impressive statistical precision\, and cast doubt on the
existence of the Θ + (1540). The experimental status wil
l be discussed\, including some recent positive results. The past contrib
utions and ongoing efforts of the Hermes experiment will be highlighted.
DTSTART:20071030T193000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Pentaquarks: much ado about nothing?
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