Form factors and gauge invariance in pion photoproduction

1992 ◽  
Vol 45 (5) ◽  
pp. 2511-2513 ◽  
Author(s):  
R. L. Workman ◽  
H. W. L. Naus ◽  
S. J. Pollock
Keyword(s):  
Gauge Invariance ◽  
Form Factors ◽  
Pion Photoproduction

Low-energy pion photoproduction from p-shell nuclei

1990 ◽  
Vol 68 (11) ◽  
pp. 1270-1278 ◽  
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.

scholarly journals Vertex operators for production of baryon resonances in nucleon-gamma collisions with preserving gauge invariance and analyticity

2016 ◽  
Vol 31 (35) ◽  
pp. 1650193 ◽  
Author(s):  
A. V. Anisovich ◽  
V. V. Anisovich ◽  
A. V. Sarantsev
Keyword(s):  
Gauge Invariance ◽  
Form Factors ◽  
Arbitrary Spin ◽  
Vertex Operators ◽  
Spin Parity ◽  
Baryon Resonances

Vertex operators for photo- and electro-production of baryon states with arbitrary spin-parity, [Formula: see text], are constructed. The operators obey gauge invariance and analyticity constraints. Analyticity is realized as a requirement of the generalized Siegert theorem for vertex form factors.

RESONANCE DYNAMICS IN COUPLED CHANNELS

2014 ◽  
Vol 26 ◽  
pp. 1460054 ◽  
Author(s):  
MICHAEL DÖRING
Keyword(s):  
Partial Wave ◽  
Gauge Invariance ◽  
Pion Photoproduction ◽  
General Properties ◽  
Coupled Channels ◽  
Resonance Properties ◽  
S Matrix ◽  
Three Body ◽  
Coupled Channel

General properties of the S-matrix, such as constraints from two- and three-body unitarity as well as gauge invariance, are discussed and illustrated for the example of a dynamical coupled channel approach. The Jülich model has been updated to analyze πN, ηN, and KY production as well as pion photoproduction. Partial wave amplitudes and resonance properties are determined.

Gauge invariance of form factors

1961 ◽  
Vol 22 (6) ◽  
pp. 1321-1323 ◽  
Author(s):  
P. Budini ◽  
T. Weber
Keyword(s):  
Gauge Invariance ◽  
Form Factors

scholarly journals Off-shell form factors and low energy theorems for pion photoproduction

1990 ◽  
Vol 41 (6) ◽  
pp. 2852-2864 ◽  
Author(s):  
H. W. L. Naus ◽  
J. H. Koch ◽  
J. L. Friar
Keyword(s):  
Form Factors ◽  
Pion Photoproduction ◽  
Low Energy ◽  
Shell Form

scholarly journals Gauge invariance and form factors for the decayB→γl+l−

2003 ◽  
Vol 67 (3) ◽  
Author(s):  
Frank Krüger ◽  
Dmitri Melikhov
Keyword(s):  
Gauge Invariance ◽  
Form Factors

Gauge invariance and Regge-pole sum rules for pion photoproduction

1967 ◽  
Vol 49 (2) ◽  
pp. 333-337 ◽  
Author(s):  
R. Musto ◽  
F. Nicodemi
Keyword(s):  
Gauge Invariance ◽  
Sum Rules ◽  
Regge Pole ◽  
Pion Photoproduction

scholarly journals Dual model form factors and pion photoproduction

1985 ◽  
Vol 31 (1) ◽  
pp. 283-284 ◽  
Author(s):  
Charles Picciotto
Keyword(s):  
Form Factors ◽  
Pion Photoproduction ◽  
Dual Model ◽  
Model Form

Dual model form factors and pion photoproduction

1985 ◽  
Vol 31 (1) ◽  
pp. 285-286
Author(s):  
C. A. Dominguez
Keyword(s):  
Form Factors ◽  
Pion Photoproduction ◽  
Dual Model ◽  
Model Form

THE STRUCTURE OF 6Li AND ITS COULOMB FORM FACTORS

1971 ◽  
Vol 32 (C5) ◽  
pp. C5b-269-C5b-270
Author(s):  
Kuniharu Kubodera
Keyword(s):  
Form Factors
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