Summary
Recent very precise data on the K0 regeneration amplitude in carbon at high energy are analysed, together with lower-energy data. Their energy dependence is significantly different from that of the ω Regge exchange term in KN scattering, showing unambiguously the influence of nuclear effects at the level of a «secondary» Regge contribution. The origin of these effects is discussed within the framework of the multiple-scattering theory. From a theoretical point of view, one expects the ω-pomeron nuclear cut to lower the effective ω intercept in carbon; however, this possible qualitative explanation is not supported by qualitative calculations. A purely phenomenological analysis reveals that the effect observed is mainly due to the energy variation of the inelastic contributions to the double-scattering term.
Riassunto
Si analizzano recenti dati molto precisi riguardo all’ampiezza di rigenerazione di K0 nel carbonio ad alta energia, assieme con i dati ad energia più bassa. La loro dipendenza dall’energia è differente in maniera significativa da quella del termine di scambio di Regge di ω nello scattering KN, così mostrando in maniera chiara l’influenza degli effetti nucleari a livello di un contributo di Regge «secondario». L’origine di questi effetti è discussa all’interno del sistema della teoria dello scattering multiplo. Da un punto di vista teorico ci si aspetta che il taglio nucleare tra ω e il pomerone abbassi l’effettivo intercetto di ω nel carbonio; comunque questa possibile spiegazione qualitativa non è appoggiata da calcoli quantitativi. Un’analisi puramente fenomenologica rivela che l’effetto osservato è principalmente dovuto alla variazione di energia dei contributi anelastici al termine dello scattering doppio.
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Fellow of Coordenação do Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil.
Laboratoire associé au Centre National de la Recherche Scientifique (No. L.A. 280).
Postal address: Laboratoire de Physique Théorique et Hautes Energies, Université Paris VII, Tour 33–43, Ler étage, 2 Place Jussieu, 75221, Paris Cedex 05, France.
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Diu, B., de Camargo, A.F. Regge behaviour and nuclear effects: K0 regeneration on carbon. Nuov Cim A 47, 495–517 (1978). https://doi.org/10.1007/BF02896239
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DOI: https://doi.org/10.1007/BF02896239