A Unitary isobar model for pion photoproduction and electroproduction on the proton up to 1-GeV

Drechsel, D.; Hanstein, O.; Kamalov, S.S.; Tiator, L.

doi:10.1016/S0375-9474(98)00572-7

A Unitary isobar model for pion photoproduction and electroproduction on the proton up to 1-GeV

Jul, 1998

32 pages

Published in:

Nucl.Phys.A 645 (1999) 145-174

e-Print:

nucl-th/9807001 [nucl-th]

DOI:

10.1016/S0375-9474(98)00572-7

Report number:

MKPH-T-98-10

View in:

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Abstract:

A new operator for pion photo- and electroproduction has been developed for nuclear applications at photon equivalent energies up to 1 GeV. The model contains Born terms, vector mesons and nucleon resonances (

P_{33}(1232)

,

P_{11}(1440)

,

D_{13}(1520)

,

S_{11}(1535)

,

F_{15}(1680)

, and

D_{33}(1700)

). The resonance contributions are included taking into account unitarity to provide the correct phases of the pion photoproduction multipoles. The

Q^2

dependence of electromagnetic resonance vertices is described with appropriate form factors in the electromagnetic helicity amplitudes. Within this model we have obtained good agreement with the experimental data for pion photo- and electroproduction on the nucleon for both differential cross sections and polarization observables. The model can be used as a starting point to predict and analyze forthcoming data.

Note:

32 pages LaTeX including 23 postscript figures (a few misprints have been corrected) Report-no: MKPH-T-98-10

13.60.Le
14.20.Gk
Pion
Photoproduction
Electroproduction
Multipoles
Baryon resonances
photon p: exclusive reaction
electron p: exclusive reaction
photon: polarized beam

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Figures(0)

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