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DESCRIPTION:Charles Hanretty \, Florida State University\n\nThe quest for a
n understanding of the internal dynamics of the most fundamental systems i
n nature\, the Hadron\, continues. The theory of Quantum Chromodynamics\,
developed to describe these systems\, explains many of the interactions wh
ich occur in the Hadron. This theory however cannot presently be solved an
alytically in the low-energy regime\, the realm of non-perturbative QCD. T
herefore in the place of these solutions\, models of the baryon are used w
hich treat the baryon as a system of three constituent quarks. These model
s however predict an excited baryon spectrum that has a higher density of
states than that which has been observed experimentally. This is the so-ca
lled “missing resonance” problem. With the ultimate goal of finding ev
idence for the existence (or non-existence) of these resonances\, quantiti
es called “polarization observables” can be measured. These quantities
which occur when the constraint of polarization is imposed on the reactio
ns are highly sensitive to resonance production. In recent years\, both si
ngle- and double-polarization experiments have been carried out at Jeffers
on Lab in Newport News\, Virginia with the goal of resolving this missing
resonance problem. One such polarized photoproduction experiment used line
arly polarized photons incident on an unpolarized LH2 target. The analysis
of a double meson final state from this polarized photoproduction data ut
ilizing the power of a kinematic fitter has the ability to make highly acc
urate measurements of these observables. The analysis of γ\; p →\
; p π\; + π\; - reactions and the extrac
tion of two such observables\, Is and Ic\, is discussed.
DTSTART:20101013T193000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Measurement of the Polarization Observables I s and I
c for γ\; p →\; p π\; + π\; - using the CLAS Spectrometer
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