Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprc10002s&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Electroproduction of the Δ(1232) can be used to study the mechanisms responsible for quark confinement and resonance formation. In particular, the Q^2 dependence of the multipoles E_1+ and S_1+ in the NarrowΔ quadrupole transition is especially sensitive to the shape of the nucleon and the evolution from pion to quark degrees of freedom. Recent π^0 electroproduction data taken using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab permit a complete separation of the response functions σ_TT and σ_LT, which show high sensitivity to the quadrupole strength. New experimental results for the ratios E_1+/M_1+ and S_1+/M_1+ are presented using a partial wave analysis over a Q^2 range of 0.4 to 1.8 GeV^2. Results will be compared to quark models as well as recent unitary models which include the dynamical effects of the pion cloud.
Joo Kyungseon
Smith Cole
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