The electroproduction of the $\Delta$(1232) in the chiral quark-soliton model

A. Silva (CFC; Bochum); Coimbra U.); Coimbra U. & Ruhr U.; D. Urbano (F.E.; K. Goeke (Ruhr U.; M. Fiolhais (CFC; Porto U.); Res.Ctr.Nucl.Phys.); T. Watabe (Osaka U.

arxiv: hep-ph/9905326 · v2 · submitted 1999-05-13 · ✦ hep-ph

The electroproduction of the Delta(1232) in the chiral quark-soliton model

A. Silva (CFC , Coimbra U. & Ruhr U. , Bochum) , D. Urbano (F.E. , Porto U.) , T. Watabe (Osaka U. , Res.Ctr.Nucl.Phys.) , M. Fiolhais (CFC

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Coimbra U.) K. Goeke (Ruhr U.

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keywords ratioschiraldeltaelectroproductionmodelquark-solitonresultsaccount

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We calculate the ratios E2/M1 and C2/M1 for the electroproduction of the $\Delta$(1232) in the region of photon virtuality $0<-q^2<1$ GeV$^2$. The magnetic dipole amplitude M1 is also presented. The theory used is the chiral quark-soliton model, which is based in the instanton vaccum of the QCD. The calculations are performed in flavor SU(2) and SU(3) taking rotational ($1/N_c$) corrections into account. The results for the ratios agree qualitatively with the available data, although the magnitude of both ratios seems to underestimate the latest experimental results.

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The electroproduction of the Delta(1232) in the chiral quark-soliton model

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