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Nondiffractive feature of with -meson electromagnetic multipole moments
We investigate photoproduction of charged off the nucleon using
Regge pole exchanges by considering the -meson
electromagnetic multipole moments. The significance of the Ward identity at the
vertex is emphasized for current conservation in the process.
Given exchange with the well-known coupling constants for
and , we analyze the role of the exchange in the and processes without model-dependences except
for the magnetic moment and electric quadrupole moment
fm taken from theoretical estimates. The
nondiffractive feature of both cross sections is reproduced with a rapid
decrease beyond the resonance region by the dominance of exchange over
the \,. % Cross sections for differential and density matrix elements are
presented to compare with existing data. The parity and photon polarization
asymmetries are predicted to demonstrate the apparent roles of the -meson
electromagnetic multipole moments.Comment: 5 pages, 8 figure
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