Summary
AnS-matrix calculation is made using theN/D method for the low-energyS-wave π-π scattering. The approximation involves replacing the left-hand cut by two poles whose positions are fixed a priori. Their residues are then determined using the approximate crossing relations at the symmetry point. The calculations suggest that «satisfactory» solutions are obtained with\(A{}_0^0 \left( {\upsilon _0 } \right)\left( { \approx - 5\lambda } \right) = - 0.6\). TheS-wave phase shifts are repuisive in both isobaric spin states with scattering lengthsa 1 (sign convention: δ=−ak,k→0):a 0≈+1.1,a 2≈+0.5.
Riassunto
Si esegue un calcolo della matriceS col metodoN/D per lo scattering π-π di bassa energia in ondaS. L'approssimazione comporta la sostituzione del taglio sinistro con due poli le cui posizioni sono fissate a priori. Si determinano poi i loro residui con le relazioni d'incrocio approssimate nel punto di simmetria. I calcoli suggeriscono che si ottengono soluzioni «soddisfacenti» con\(A{}_0^0 \left( {\upsilon _0 } \right)\left( { \approx - 5\lambda } \right) = - 0.6\). Gli spostamenti di fase dell'ondaS sono ripulsivi in entrambi gli stati di spin isobarico con lunghezze di scatteringa 1 (convenzione per il segno: δ=−ak,k→0):a 0≈+1.1,a 2≈+0.5.
Similar content being viewed by others
References
N. N. Khuri andS. B. Treiman:Phys. Rev.,119, 1115 (1960).
M. Gell-Mann andA. H. Rosenfeld:Ann. Rev. Nucl. Sci.,7, 407 (1957).
G. F. Chew andF. E. Low:Phys. Rev.,113, 1640 (1959).
D. D. Carmony andR. T. Van de Walle:Phys. Rev. Lett.,8, 73 (1962).
E. Pickup, D. K. Robinson andE. O. Salant:Phys. Rev. Lett.,7, 192, 742 (1961).
H. J. Schnitzer:Phys. Rev.,125, 1059 (1962);J. Kirz, J. Schwartz andR. D. Tripp:Phys. Rev.,126, 763 (1962);N. Schmitz:Nuovo Cimento,31, 255 (1964).
J. Hamilton, T. D. Spearman andW. S. Woolcock:Ann. Phys.,17, 1 (1962);K. Ishida, A. Takahashi andY. Ueda:Progr. Theor. Phys. (Japan),23, 737 (1960);K. Ishida:Progr. Theor. Phys. (Japan),25, 797 (1961);A. V. Efremov, V. A. Meshcheryakov andD. V. Shirkov:Sov. Phys. JETP,12, 308 (1961).
M. A. B. Bég andP. C. De Celles:Phys. Rev. Lett.,8, 46 (1962).
A. Abashian, N. E. Booth andK. M. Crowe:Phys. Rev. Lett.,5, 258 (1960); and a series of four papers following the one inPhys. Rev.,132, 2296 (1963).
V. V. Anisovich andL. G. Dakhno:Phys. Lett.,10, 221 (1964).
L. A. P. Balázs:Phys. Rev.,128, 1939 (1962).
G. F. Chew andS. Mandelstam:Nuovo Cimento,19, 752 (1961).
J. D. Bjorken andA. Goldberg:Nuovo Cimento,16, 539 (1960).
J. L. Uretsky andK. Smith:Phys. Rev.,131, 761 (1963);A. Saperstein andJ. L. Uretsky:Phys. Rev.,133, B 1340 (1964);M. Alexanian andM. Wellner:Phys. Rev.,140, B 1079 (1965).
R. E. Kreps, L. F. Cook, J. J. Brehm andR. Blankenbecler:Phys. Rev.,133, B 1526 (1964).
G. R. Allcock andA. N. Kamal:Proc. Phys. Soc.,77, 278 (1961);A. N. Kamal:Ph. D. Thesis (unpublished), Liverpool University (1962).
Author information
Authors and Affiliations
Additional information
Traduzione a cura della Redazione.
Rights and permissions
About this article
Cite this article
Kamal, A.N. S-Wave pion-pion scattering. Nuovo Cimento A (1965-1970) 44, 1055–1067 (1966). https://doi.org/10.1007/BF02719349
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02719349