Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions

Details Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions

2000-10-07

arxiv.org/abs/nucl-th/0010025v1

Phys.Rev. C63 (2001) 055201

Physics

Nuclear Physics

Nuclear Theory

39 pages,17 figures, with RevTeX, to be submitted Phys. Rev. C

Scientific paper

10.1103/PhysRevC.63.055201

The dynamical model developed in [Phys. Rev. C 54, 2660 (1996)] has been applied to investigate the pion electroproduction reactions on the nucleon. It is found that the model can describe to a very large extent the recent data of p(e,e' pi^0) reaction from Jefferson Laboratory and MIT-Bates. The extracted magnetic dipole(M1), electric dipole(E2), and Coulomb(C2) strengths of the gamma N -> Delta transition are presented. It is found that the C2/M1 ratio drops significantly with Q^2 and reaches about -13% at Q^2=4 (GeV/c)^2, while the E2/M1 ratio remains close to the value \sim -3 % at the Q^2=0 photon point. The determined M1 transition form factor drops faster than the usual dipole form factor of the proton. We also find that the non-resonant interactions can dress the gamma N -> Delta vertex to enhance strongly its strength at low Q^2, but much less at high Q^2. Predictions are presented for future experimental tests. Possible developments of the model are discussed.

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