The pseudoscalar pion-nucleon interaction with the method of unitary Padé approximants of theS-matrix

1969 ◽  
Vol 64 (4) ◽  
pp. 733-797 ◽  
Author(s):  
J. A. Mignaco ◽  
M. Pusterla ◽  
E. Remiddi
Keyword(s):  
Padé Approximants ◽  
Nucleon Interaction ◽  
Pade Approximants ◽  
Pion Nucleon ◽  
Thes Matrix

scholarly journals Low energy pion-nucleon phase shifts from a Padé approximants' approach

1968 ◽  
Vol 27 (1) ◽  
pp. 34-37
Author(s):  
E. Remiddi ◽  
M. Pusterla ◽  
J.A. Mignaco
Keyword(s):  
Padé Approximants ◽  
Phase Shifts ◽  
Low Energy ◽  
Pade Approximants ◽  
Pion Nucleon

Numerical Evaluation of Partial Wave Contributions to Pion–Nucleon Amplitudes

1974 ◽  
Vol 52 (8) ◽  
pp. 731-742 ◽  
Author(s):  
Robert C. Brunet
Keyword(s):  
Partial Wave ◽  
Fourth Order ◽  
Numerical Evaluation ◽  
Padé Approximants ◽  
Feynman Diagrams ◽  
Order Perturbation ◽  
Pade Approximants ◽  
Pion Nucleon ◽  
Low Order

We present detailed numerical evaluations of the partial wave projections of Feynman diagrams of second- and fourth-order in perturbation for the πN–πN scattering in the [Formula: see text] theory. Perturbative contributions to the S, P, and D waves of isospin 1/2 and 3/2 are given in tables of numerical values. Figures regrouping these results show surprising behavior for the ratios Re(4)/Re(2). These tables and figures allow easy calculations with models using low order perturbation terms such as Padé approximants.

Pion-nucleon phase shifts and Padé approximants

1973 ◽  
Vol 53 (1) ◽  
pp. 191-196 ◽  
Author(s):  
M.C. Bergere ◽  
J.M. Drouffe
Keyword(s):  
Padé Approximants ◽  
Phase Shifts ◽  
Pade Approximants ◽  
Pion Nucleon
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