Dresden 2000 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 14: Postersitzung / Theorie
HK 14.18: Poster
Thursday, March 23, 2000, 10:15–12:45, B 113
E2/M1 and C2/M1 for the Electroproduction of the Δ(1232) in the Chiral Quark–soliton Model — •A. Silva1,2, D. Urbano1,3, T. Watabe4, M. Fiolhais2, and K. Goeke1 — 1Institut f. Theoretische Physik II, Ruhr–Universität Bochum — 2Departamento de Física and Centro de Física Computacional, Universidade de Coimbra, P-3004-516 Coimbra, Portugal — 3Faculdade de Engenharia da Universidade do Porto, Rua dos Gragas, P-4000 Porto, Portugal — 4Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 657, Japan.
The ratios E2/M1 and C2/M1 for the electroproduction of the Δ(1232) have always deserved special attention, both experimental and theoretically, in the studies of the nucleon structure. We present the results for these ratios in the interval of photon virtuality 0<−q2<1 GeV2 and compare them with the most recent experimental data (e.g. from Bonn-ELSA and CEBAF.) The ratios are obtained using the SU(2) and SU(3) flavour chiral quark–soliton model [1], which is treated in the framework of large number of colours (Nc). The comparison with the experiment shows both some underestimation of the experimental results and a good agreement for the dependence of the ratios with −q2 [2].
[1] Chr. Christov et al., Prog. Part. Nucl. Phys. 37, 91 (1996)
[2] A. Silva et al., hep-ph/9905326