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DESCRIPTION:Stepan Stepanyan\, Jefferson Lab\n\nIn the past two years more
than 13 experiments have reported observation of a narrow exotic S=+1 bary
on state in the mass range from 1.525 to 1.55 GeV/c2. The mini
mal quark content of this state\, now called the Θ+\, is uud
ds. In contrast to almost fully exclusive experiments at low energies tha
t have reported evidence for the Θ+\, there have been a numb
er of reports of non-observation of this state\, mostly in high energy inc
lusive experiments. The main criticisms of the reported Θ+
signals are insufficient statistics\, and variation in mass. Evidence for
the doubly strange\, Φ-- (known as Ξ--)\,and
for the charmed\, Θc\, pentaquarks have been presented only
in the single experiments.\n\nThe CLAS Collaboration at Jefferson Laborato
ry has published two papers on the experimental evidence for the Θ
+ and Ξ--. These data now represent the world's large
st data sets for photoproduction on hydrogen and deuterium. In this talk
an overview of the experimental situation on the pentaquarks and the preli
minary results of high statistics CLAS experiments will be presented.
DTSTART:20051101T203000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Hunting the Pentaquark
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