Meson form-factors and wave-functions with Wilson fermions

The covariant Faddeev approach which describes baryons as relativistic three-quark bound states and is based on the Dyson-Schwinger and Bethe-Salpeter equations of QCD is briefly reviewed. All elements, including especially the baryons’ three-body-wave-functions, the quark propagators and the dressed quark-photon vertex, are calculated from a well-established approximation for the quark-gluon interaction. Selected previous results of this approach for the spectrum and elastic electromagnetic form factors of ground-state baryons and resonances are reported. The main focus of this talk is a presentation and discussion of results from a recent investigation of the electromagnetic transition form factors between ground-state octet and decuplet baryons as well as the octet-only Σ0 to Λ transition.

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NATURAL ORBITALS AND ELECTRON ELASTIC MAGNETIC SCATTERING BY NUCLEI

International Journal of Modern Physics E ◽

10.1142/s0218301396000396 ◽

1996 ◽

Vol 05 (04) ◽

pp. 717-724 ◽

Cited By ~ 4

Author(s):

D.N. KADREV ◽

A.N. ANTONOV ◽

M.V. STOITSOV ◽

S.S. DIMITROVA

Keyword(s):

Density Fluctuation ◽

Form Factors ◽

Wave Functions ◽

Magnetic Scattering ◽

Correlation Effects ◽

Valence Nucleon ◽

Nucleon System ◽

Natural Orbitals ◽

Transverse Form Factor ◽

Fluctuation Model

Natural orbitals obtained within the coherent density fluctuation model and containing nucleon correlation effects are used to calculate characteristics of the A-nucleon system, such as the electron elastic magnetic scattering form factors. The calculations are performed for nuclei with a doubly-closed core and a valence nucleon in a stretched configuration (j=l+1/2), such as the 17 O and 41 Ca nuclei. It is shown that the calculations of the transverse form factor using natural orbitals improve the agreement with the experimental data in comparison with the case when shell-model single-particle wave functions are used.

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Inelastic electric and magnetic electron scattering form factors of 24Mg nucleus: Role of g factors

International Journal of Modern Physics E ◽

10.1142/s021830131750032x ◽

2017 ◽

Vol 26 (05) ◽

pp. 1750032 ◽

Cited By ~ 1

Author(s):

Anwer A. Al-Sammarraie ◽

M. L. Inche Ibrahim ◽

Muna Ahmed Saeed ◽

Fadhil I. Sharrad ◽

Hasan Abu Kassim

Keyword(s):

Experimental Data ◽

Electron Scattering ◽

Form Factors ◽

Wave Functions ◽

Matrix Elements ◽

Model Hamiltonian ◽

Transverse Electron ◽

Magnetic Electron ◽

Good Agreement

The electric and magnetic transitions in the [Formula: see text]Mg nucleus are studied based on the calculations of the longitudinal and the transverse electron scattering form factors. The universal sd-shell model Hamiltonian (USDA) is used for calculations. The wave functions of radial single-particle matrix elements are calculated using the Skyrme potential. For the longitudinal form factors, a good agreement is obtained between the calculations and the experimental data. For the transverse form factors, the effective [Formula: see text] factors are made as adjustable parameters in order to describe the experimental data.

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Asymptotic properties of wave functions and form factors of relativistic bound states

Il Nuovo Cimento A ◽

10.1007/bf02825370 ◽

1968 ◽

Vol 58 (4) ◽

pp. 783-803 ◽

Cited By ~ 38

Author(s):

D. Amati ◽

L. Caneschi ◽

R. Jengo

Keyword(s):

Bound States ◽

Asymptotic Properties ◽

Form Factors ◽

Wave Functions ◽

Relativistic Bound States

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PROBING THE PARTON CONTENT OF THE NUCLEON

Modern Physics Letters A ◽

10.1142/s0217732309001091 ◽

2009 ◽

Vol 24 (35n37) ◽

pp. 2882-2892 ◽

Cited By ~ 5

Author(s):

SIGFRIDO BOFFI ◽

BARBARA PASQUINI

Keyword(s):

Light Cone ◽

Cloud Model ◽

Form Factors ◽

Wave Functions ◽

Electromagnetic Form Factors ◽

Transition Distribution ◽

Meson Cloud

The parton content of the nucleon is explored within a meson-cloud model developed to derive light-cone wave functions for the physical nucleon. The model is here applied to study electromagnetic form factors, distribution amplitudes and nucleon-to-meson transition distribution amplitudes.

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Low-energy pion photoproduction from p-shell nuclei

Canadian Journal of Physics ◽

10.1139/p90-183 ◽

1990 ◽

Vol 68 (11) ◽

pp. 1270-1278 ◽

Cited By ~ 5

Author(s):

C. Bennhold ◽

L. Tiator ◽

L. E. Wright

Keyword(s):

Form Factors ◽

Pion Photoproduction ◽

Binding Energies ◽

Wave Functions ◽

Low Energy ◽

Delta Resonance ◽

Transverse Electromagnetic ◽

Coulomb Effects ◽

Correction Terms ◽

Space Approach

Low-energy pion photoproduction off 6Li, 10B, and 14N has been reinvestigated in a DWIA framework that includes a number of improvements neglected in previous analyses. The production operator is based on Feynman diagrams and includes correction terms of order p2/M2 and higher. An s-channel delta resonance term is included with both longitudinal and transverse electromagnetic couplings. Rather than using on harmonic oscillator for the nucleon orbitals we employ Woods–Saxon wave functions that have been adjusted to fit electron-scattering form factors and single-particle binding energies. Furthermore, we include the Coulomb potential without approximation in our momentum-space approach. Using more realistic wave functions and including corrections to the production amplitude that have been neglected before leads to considerable improvement in the case of 10B and 14N when compared with existing data. The Coulomb effects are shown to change the cross section by about 30% close to threshold but are negligible at higher energies.

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