Summary
A calculation is made of the twoS-phase shifts of pion-nucleon scattering corresponding to isotopic spin statesT=1/2 andT=3/2, using the Tamm-Dancoff method and an extended source model for the nucleon. The magnitude and energy variation of the α3 phase-shift agree reasonably well with experiment. The sign of the α1 phase-shift is correct, but its magnitude is completely wrong. It is likely, however, that α1 is theS-phase shift which will be seriously altered by taking account of renormalization effects in a more rigorous treatment of the problem.
Riassunto
Si calcolano i due spostamenti della faseS dello scattering pione-nucleone corrispondenti agli stati di spin isotopicoT=1/2 eT=3/2 per mezzo del metodo di Tamm-Dancoff e di un modello a sorgente estesa pel nucleone. La grandezza e la variazione d'energia dello spostamento di fase α3 si accordano soddisfacentemente coll'esperienza. Il segno dello spostamento di fase α1} è il giusto, ma la sua grandezza risulta totalmente diversa dal risultato sperimentale. È, tuttavia, probabile che lo spostamento α1 della faseS cisulti profondamente modificato, se in una trattazione più rigorosa del problema si tier conto degli effetti della rinormalizzazione.
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S. W. Barnes, C. E. Angell, J. P. Perry, D. Miller, J. Ring andD. Nelson:Phys. Rev.,92, 1327 (1953).
D. Bodansky, A. M. Sachs andJ. Steinberger:Bull. Amer. Phys. Soc.,28 (n. 6), 14 (1953).
cf.Proc. Rochester Conference on High Energy Physics, Interscience Publishers, 1953.
H. L. Anderson, E. Fermi, R. Martin andD. E. Nagle:Phys. Rev.,91, 155 (1953).
R. E. Marshak:Phys. Rev.,88, 1208 (1952);A. E. Woodruff:Bull. Amer. Phys. Soc.,28 (n. 4), 19 (1953).
Cfr.F. J. Dyson:Phys. Rev.,73, 929 (1948).
Cf.S. Drell andE. Henley:Phys. Rev.,88, 1053 (1952).
G. F. Chew:Phys. Rev.,89, 591 (1953).
J. Ashkin, A. Simon andR. E. Marshak:Prog. Theor. Phys.,5, 634 (1950).
Cf.M. M. Lévy:Proc. Japanese Conf. on Theor. Phys., September 1953.
A similar independent calculation has been performed byN. Fukuda:Proc. Japanese Conf. on Theor. Phys., September 1953.
M. M. Lévy:Phys. Rev. (in press).
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These calculations were started during the authors' visit to the Tata Institute of Fundamental Research (Bombay) in August 1953.
Traduzione a cura della Redazione.
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Lévy, M.M., Marshak, R.E. TheS-wave in pion-nucleon scattering. Nuovo Cim 11, 366–371 (1954). https://doi.org/10.1007/BF02783626
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DOI: https://doi.org/10.1007/BF02783626