Electromagnetic transition form factors and dilepton decay rates of nucleon resonances

Details Electromagnetic transition form factors and dilepton decay rates of nucleon resonances Electromagnetic transition form factors and dilepton decay rates of nucleon resonances

2001-10-25

arxiv.org/abs/nucl-th/0110066v2

Annals Phys.296:299-346,2002

Physics

Nuclear Physics

Nuclear Theory

An error in the code is found and fixed. Numerical results for the spin-half nucleon resonances changed. A few misprints are r

Scientific paper

10.1006/aphy.2002.6223

Relativistic, kinematically complete phenomenological expressions for the dilepton decay rates of nucleon resonances with arbitrary spin and parity are derived in terms of the magnetic, electric, and Coulomb transition form factors. The dilepton decay rates of the nucleon resonances with masses below 2 GeV are estimated using the extended vector meson dominance model for the transition form factors. The model provides a unified description of the photo- and electroproduction data, the vector meson decays, and the dilepton decays of the nucleon resonances. The constraints on the transition form factors from the quark counting rules are taken into account. The parameters of the model are fixed by fitting the available photo- and electroproduction data and using results of the multichannel partial-wave analysis of the $\pi N$ scattering. Where experimental data are not available, predictions of the non-relativistic quark models are used as an input. The vector meson coupling constants of the magnetic, electric, and Coulomb types are determined. The dilepton widths and the dilepton spectra from decays of nucleon resonances with masses below 2 GeV are calculated.

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