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Regge behaviour and nuclear effects: K0 regeneration on carbon

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Il Nuovo Cimento A (1965-1970)

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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To speed up publication, the authors of this paper have agreed to not receive the proofs for correction.

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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