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

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.

Low energy expansions for double-pion photoproduction

1994 ◽  
Vol 73 (3) ◽  
pp. 400-403 ◽  
Author(s):  
M. Benmerrouche ◽  
E. Tomusiak
Keyword(s):  
Pion Photoproduction ◽  
Low Energy ◽  
Double Pion

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

Pion photoproduction in the skyrme model and low-energy theorems

1991 ◽  
Vol 526 (3-4) ◽  
pp. 733-750 ◽  
Author(s):  
Stefan Scherer ◽  
Dieter Drechsel
Keyword(s):  
Skyrme Model ◽  
Pion Photoproduction ◽  
Low Energy

scholarly journals Weak interaction effects in low energy pion photoproduction

1979 ◽  
Vol 57 (6) ◽  
pp. 809-814 ◽  
Author(s):  
R. M. Woloshyn
Keyword(s):  
Weak Interaction ◽  
Neutral Current ◽  
Interaction Effects ◽  
Pion Photoproduction ◽  
Low Energy ◽  
Weak Neutral Current ◽  
Pion Nucleon

Weak interaction induced parity-violating asymmetries in low energy pion photoproduction are calculated to be of order 10−7. The problem of isolating the weak neutral current dominated pion–nucleon coupling is discussed.

Low-Energy Theorems onKl3Decay Form Factors Based on Broken Chiral Symmetry

1970 ◽  
Vol 2 (3) ◽  
pp. 569-572 ◽  
Author(s):  
N. G. Deshpande
Keyword(s):  
Chiral Symmetry ◽  
Form Factors ◽  
Low Energy

scholarly journals Asymptotic Behavior of Off-Mass-Shell Form Factors

1973 ◽  
Vol 49 (5) ◽  
pp. 1755-1757
Author(s):  
Kazo Nakazawa
Keyword(s):  
Asymptotic Behavior ◽  
Mass Shell ◽  
Form Factors ◽  
Shell Form

PION PHOTOPRODUCTION IN A GAUGE-INVARIANT CHIRAL UNITARY FRAMEWORK

2014 ◽  
Vol 26 ◽  
pp. 1460075
Author(s):  
MAXIM MAI ◽  
PETER C. BRUNS ◽  
ULF-G. MEIßNER
Keyword(s):  
Magnetic Moments ◽  
Pion Photoproduction ◽  
Low Energy ◽  
Leading Order ◽  
S Wave ◽  
Gauge Invariant ◽  
Unitary Extension ◽  
Pion Nucleon ◽  
Energy Constants ◽  
Order Contact

We investigate pion photoproduction off the proton in a manifestly gauge-invariant chiral unitary extension of chiral perturbation theory. In a first step, we consider meson-baryon scattering taking into account all next-to-leading order contact interactions. The resulting low-energy constants are determined by a fit to s-wave pion-nucleon scattering and the low-energy data for the reaction π-p → ηn. Having determined the low-energy constants, we then analyse the data on the s-wave multipole amplitudes E0+ of pion and eta photoproduction. These are parameter-free predictions, as the two new low-energy constants are determined by the neutron and proton magnetic moments.

On the off-mass-shell form factors of the nucleon

1970 ◽  
Vol 65 (4) ◽  
pp. 597-606 ◽  
Author(s):  
A. Komatsuzawa ◽  
K. Nakazawa ◽  
R. Sugano
Keyword(s):  
Mass Shell ◽  
Form Factors ◽  
Shell Form

Chiral Symmetry And Low Energy Pion Photoproduction

1992 ◽  
pp. 151-158
Author(s):  
S. K. Singh
Keyword(s):  
Chiral Symmetry ◽  
Pion Photoproduction ◽  
Low Energy
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