Electromagnetic N-$Δ$ transition form factors in a covariant quark-diquark model

Details Electromagnetic N-$Δ$ transition form factors in a covariant quark-diquark model Electromagnetic N-$Δ$ transition form factors in a covariant quark-diquark model

1996-10-10

arxiv.org/abs/nucl-th/9610014v1

Z.Phys.A359:91-97,1997

Physics

Nuclear Physics

Nuclear Theory

16 pp, RevTeX, 7 figs, uses epsf

Scientific paper

10.1007/s002180050371

The electromagnetic N-$\Delta$ transition form factors are calculated in the framework of a formally covariant constituent diquark model. As a spin-3/2 particle the $\Delta$ is assumed to be a bound state of a quark and an axial-vector diquark. The wave function is obtained from a diquark-quark Salpeter equation with an instantaneous quark exchange potential. The three transition form factors are calculated for momentum transfers squared from the pseudothreshold $(M_\Delta-M_N)^2$ up to $-2 (GeV/c)^2$. The magnetic form factor is in qualitative agreement with experiment. We find very interesting results for the ratios E2/M1 and C2/M1.

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