Electromagnetic transition form factors and dilepton decay rates of nucleon resonances

Amand Faessler; B.V. Martemyanov (Tubingen U. & Moscow; C. Fuchs (Tubingen U.); ITEP); M.I. Krivoruchenko

Electromagnetic transition form factors and dilepton decay rates of nucleon resonances

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arxiv nucl-th/0110066 v2 pith:QSMPJ72Y submitted 2001-10-25 nucl-th hep-ph

M.I. Krivoruchenko , B.V. Martemyanov (Tubingen U. & Moscow , ITEP) , Amand Faessler , C. Fuchs (Tubingen U.) This is my paper · ORCID

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keywords dileptonnucleonresonancesfactorsformtransitiondatadecay

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abstract

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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Electromagnetic nucleon form factors in the extended vector meson dominance model
hep-ph 2024-12 conditional novelty 4.0 of 10

A six-parameter extended vector meson dominance model with four rho/omega radial excitations per channel is fitted to world data on nucleon form factors, giving a moderate but physically constrained description.

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