Summary
We present a set of calculations of the reaction\(p\bar p \to Y\bar Y\) in the antiproton laboratory momentum range from 3 GeV/c to 7 GeV/c. The process is assumed to take place through K* exchange only, and the calculations are performed within the framework of the absorption model (the distorted wave Born approximation). We obtain a good description of the angular dependence of the cross-section for the three channels\(\Lambda \bar \Lambda ,\Lambda \Sigma ^0 + \bar \Lambda \Sigma ^0 \) and \(\Sigma ^ + \overline {\Sigma ^ + } \) in the whole energy range. However, the energy dependence is wrong, and appears the worst for the channel\(\Lambda \bar \Lambda \), where the angular dependence is best described.
Riassunto
Si presenta una serie di calcoli sulla reazione\(p\bar p \to Y\bar Y\) per un intervallo di impulsi dell'antiprotone nel sistema del laboratorio da 3 GeV/c a 7 GeV/c. Si suppone che il processo abbia luogo unicamente tramite lo scambio di K* e si effettuano i calcoli nello schema del modello di assorbimento (l'approssimazione di Born in onda distorta). Si ottiene una buona descrizione della dipendenza angolare della sezione d'urto per i tre canali\(\Lambda \bar \Lambda ,\Lambda \Sigma ^0 + \bar \Lambda \Sigma ^0 \) e\(\Sigma ^ + \overline {\Sigma ^ + } \) nell'intero intervallo di energia. Tuttavia, la dipendenza dall'energia è sbagliata e risulta pessima per il canale\(\Lambda \bar \Lambda \), dove la dipendenza angolare è meglio descritta.
Similar content being viewed by others
References
B. Musgrave, G. Petremas, L. Riddiford, R. Böck, E. Fett, B. R. French, J. B. Kinson, Ch. Peyrou, M. Szeptycka, J. Badier, M. Bazin, L. Blaskovic, B. Equer, J. Huc, S. R. Borenstein, S. J. Goldsack, D. H. Miller, J. Meyer, D. Revel, B. Tallini andS. Zylberajch:Nuovo Cimento,35, 735 (1965);R. Böck,et al.: xxxxProduction by 5.7 GeV/cantiprotons in hydrogen, report to the 1964 Dubna Conference, CERN/TC/Physics 64-18. The corresponding data are referred in the text as «CERN data».
C. Baltay.et al.: Interactions of high energy antiprotons in hydrogen, Stanford Nuclear Structure Meeting (1963);C. Baltay,et al.: Hyperon production by 7 GeV/cantiprotons in hydrogen, report to the 1964 Dubna Conference. The corresponding data are referred in the text as «Yale data».
H. D. D. Watson:Nuovo Cimento,29, 1338 (1963);C. H. Chan:Phys. Rev.,133, B 431 (1964);D. Bessis, C. Itzykson andM. Jacob:Nuovo Cimento,27, 376 (1963).
N. J. Sopkovich:Nuovo Cimento,26, 186 (1962).
A. Dar, M. Kugler, Y. Dothan andS. Nussinov:Phys. Rev. Lett.,12, 82 (1964);A. Dar andW. Tobocman:Phys. Rev. Lett. 12, 511 (1964);A. Dar:Phys. Rev. Lett.,13, 91 (1964).
L. Durand andYam Tsi Chiu:Phys. Rev. Lett.,12, 399 (1964); b)Phys. Rev.,137, B 1530 (1965).
C. Cohen-Tannoudji andH. Navelet:Nuovo Cimento,37, 1511 (1965).
K. Dietz andH. Pilkuhn:Nuovo Cimento,37, 1561 (1965);R. C. Arnold,Phys. Rev.,136, B 1388 (1964).
A. Białas andL. Van Hove:Nuovo Cimento,38, 1385 (1965).
K. Gottfried andJ. D. Jackson:Nuovo Cimento,34, 735 (1964);J. D. Jackson, J. T. Donohue, K. Gottfried, R. Keyser andB. E. Y. Svensson:Phys. Rev.,139, B 428 (1965).
R. Omnès:Phys. Rev.,137, B 649 (1965).
H. Högaasen andJ. Högaasen:Nuovo Cimento,39, 941 (1965).
J. Hamilton:The Theory of Elementary Particles (Oxford, 1959).
L. Durand andYam Tsi Chiu:Spin effects in modified single particle exchange models, Yale University preprint (1964);M. Andrews andJ. Gunson:Journ. Math. Phys.,5, 1391 (1964).
Proceedings of the 1963 Sienna International Conference on Elementary Particles (Bologna, 1964), vol.1, p. 259; vol. 2, p. 107.
L. Stodolsky andJ. J. Sakurai:Phys. Rev. Lett.,11, 90 (1963);L. Stodolsky:Phys. Rev.,134, B 1099 (1964).
Author information
Authors and Affiliations
Additional information
supported in part by OCDE-NATO
Traduzione a cura della Redazione
Rights and permissions
About this article
Cite this article
Högaasen, H., Högaasen, J. An application of the absorption model to the reactions\(p\bar p \to Y\bar Y\) . Nuovo Cimento A (1965-1970) 40, 560–575 (1965). https://doi.org/10.1007/BF02721044
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02721044