Summary
Fixed-t dispersion relations are evaluated for π+ and π0 photoproduction in the second resonance region. Only resonances in the first, second and third resonance regions are included. The predictions are in approximate agreement with experiment. It is argued that a major part of the discrepancy will come from resonances in the fourth resonance region, rather than from Regge tails or nonresonant effects.
Riassunto
Si calcolano le relazioni di dispersione pert fisso per la fotoproduzione di π+ e π0 nella seconda regione di risonanza. Si comprendono solo le risonanze nelle regioni prima, seconda e terza di risonanza. Vi è un accordo approssimato fra le previsioni e i dati sperimentali. Si deduce che il disaccordo deriva per la maggior parte da risonanze nella quarta regione di risonanza piuttosto che da parti di Regge o da effetti di non risonanza.
Реэюме
Оцениваются дисперсионные соотнощения при фиксированномt для π+ и π0 фоторождения в области второго реэонанса. В областях первого, второго и третьего реэонансов включаются только реэонансы. Полученные предскаэания приблиэительно согласуются с зкспериментом. Докаэывается, что главная часть расхождения проистекает иэ реэонансов в области четвертого реэонанса, а не иэ хвостов Редже или нереэонансных зффектов.
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Devenish, R.C.E., Leigh, W.J., Lyth, D.H. et al. Fixed-t dispersion relations for pion photoproduction in the second resonance region. Nuov Cim A 1, 155–170 (1971). https://doi.org/10.1007/BF02722618
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DOI: https://doi.org/10.1007/BF02722618