Summary
A study is made of the K
and π
elastic-scattering amplitudes in the forward direction and a comparison is made with the ISR pp total cross-section data. For the high-energy part of the amplitudes a very simple phenomenological description is given, based on duality andSU 3 symmetry. Good agreement with dispersion relations is obtained when the pomeron contribution at low energy is taken from experimental data. The pomeron contributions to the π
, K
and pp total cross-sections are shown to be equal up to a normalization constant when the energy is properly scaled for each contribution. The difference between the energy scale factors in baryon-baryon scattering and meson-baryon scattering is larger than may be expected from an additive quark model. It is predicted that the proportional increase of\(\sigma _{K^ + p} \) will be the same as for σpp at energies which are 6÷10 times smaller.
Riassunto
Si studiano le ampiezze dei processi di scattering elastico K
e π
nella direzoine in avanti e si confrontano con i dati delle sezioni d’urto totali p-p negli ISR. Per la parte di alta energia delle ampiezze si da una descrizione fenomenologica molto semplice, basata sulla dualità e sulla simmetriaSU 3. Si trova un buon accordo con le relazioni di dispersione quando ricava dai dati sperimentali il contributo del pomerone. I contributi del pomerone alle sezioni d’urto totali π
, K{
e pp si vede che sono uguali a meno di una costante di normalizzazione qualora per ogni contributo si abbia una appropriata scala di energia. La differenza tra i fattori di scala per lo scattering barione-barione e lo scattering mesone-barione è più grande di quanto ci si aspetterebbe da un modello additivo a quark. Si prevede un incremento proporzionale di\(\sigma _{K^ + p} \) uguale a quello di σpp per energia 6–10 volte inferiori.
Similar content being viewed by others
Literatur
V. Barger andR. J. N. Phillips:Phys. Rev. Lett.,24, 291 (1970).
V. Barger andR. J. N. Phillips:Phys. Rev. D,2, 1871 (1970).
V. Barger andR. J. N. Phillips:Nucl. Phys.,32 B, 93 (1971).
U. Amaldi, R. Biancastelli, C. Bosio, G. Matthiae, J. V. Allaby, W. Bartel, G. Cocconi, A. N. Diddens, R. W. Dobinson andA. M. Wetherell:Phys. Lett.,44 B, 112 (1973).
R. J. Glauber:Phys. Rev.,100, 242 (1955).
G. Wiikin:Phys. Rev. Lett.,17, 561 (1966).
G. Giacomelli: rapporteur’s talk at theXVI International Conference on High-Energy Physics (Batavia, Ill., 1972).
D. V. Bugg, D. C. Salter, G. H. Stafford, R. F. George, K. F. Riley andR. J. Tapper:Phys. Rev.,146, 980 (1966)
Total πp cross-section data:A. Citron, W. Galbraith, T. F. Kycia, B. A. Leontic, R. H. Phillips, A. Rousset andP. H. Sharp:Phys. Rev.,144, 1101 (1966);
S. Goldhaber, W. Chinowsky, G. Goldhaber, W. Lee, T. O’Halloran, Th. F. Stubbs, G. M. Pjerrou, D. H. Stork andH. K. Ticho:Phys. Rev. Lett.,9, 135 (1962)
G. H. Trilling:Nucl. Phys.,40 B, 13 (1972).
J. J. J. Kokkedee:The Quark Model (New York, N. Y. Amsterdam, 1969).
D. V. Bugg, A. A. Carter andJ. R. Carter: Rutherford Laboratory preprint, RPP/H/109 (1973).
Springer Tracts in Modern Physics, Vol.55, edited byG. Hohler (Berlin, 1970).
A. D. Martin andG. G. Ross:Nucl. Phys.,16 B, 479 (1970).
J. K. Kim:Phys. Rev. Lett.,19, 1074 (1967).
W. Langbein andF. Wagner:Nucl. Phys.,47 B, 477 (1972).
P. J. Litchfield, T. C. Bacon, I. Butterworth, J. R. Smith, E. Lesquoy, R. Strub, A. Berthon, J. Vrana, J. Meyer, E. Pauli, B. Tallini andJ. Zatz:Nucl. Phys.,30 B, 125 (1971).
M. G. Albrow, S. Andersson-Almehed, B. Bošnjakovic, C. Daum, F. C. Erné, Y. Kimura, J. P. Lagnaux, J. C. Sens, F. Udo andF. Wagner:Nucl. Phys.,30 B, 273 (1971).
C. J. Adams, J. D. Davies, J. D. Dowell, G. H. Grayer, P. M. Hattersley, R. J. Howells, C. McLeod, T. J. McHahon, H. B. van der Raay, L. Rob, C. J. S. Damerell, R. J. Homer andM. J. Hotchkiss:Phys. Rev. D,4, 2637 (1971).
J. S. Ball, G. Marchesini andF. Zachariasen:Phys. Lett.,31 B, 583 (1970).
G. F. Chew:Phys. Lett., B44, 169 (1973).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Dronkers, J. Elastic-scattering amplitudes att=0. Nuov Cim A 21, 707–722 (1974). https://doi.org/10.1007/BF02731226
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02731226