H. Walliser et G. Holzwarth, ELECTRO-EXCITATION AMPLITUDES OF THE DELTA-ISOBAR IN THE SKYRME MODEL, ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 357(3), 1997, pp. 317-324
Electro magnetic transition form factors for the excitation of the Del
ta 33-resonance are evaluated in the Skyrme model. They crucially rely
on rotationally induced deformations of the hedgehog soliton which ar
e suppressed by two N-C-orders as compared to the leading parts of the
isovector current. Partial photon coupling through vector mesons is i
ncluded in a schematic way. Recoil corrections are approx imated by a
boost to the equal-velocity frame. The results for the photodecay ampl
itudes agree with experimental numbers and the shapes of M1, E2, C2-tr
ansition form factors show essential features as observed in electro-e
xcitation experiments.