Summary
We show, in ππ scattering, that ϱ-dominance of theI=1 absorptive part, together with the weakness of exotic channels, allows us to deduce, without any detailed knowledge of theI=0 ππ amplitude, phenomenologically well-satisfied relationships between threshold ππ parameters. In particular, we reproduce the «universal curve» of Morgan and Shaw, the quasi-linearity of subthresholds-wave amplitudes and determine the size ofp- andd-wave amplitudes.
Riassunto
Si mostra, per lo scattering ππ, come la dominanza ρ della parte assorbitiva conI=1, insieme allo scarso peso del canale esotico, permetta di dedurre, senza alcuna conoscenza particolareggiata dell’ampiezza ππ conI=0, relazioni fra i parametri di soglia ππ esaurientemente soddisfatte fenomenologicamente. In particolare, si riproduce la «curva universale» di Morgan e Shaw, la quasi linearità delle ampiezze delle ondes di sottosoglia e si determina il valore dell’ampiezza delle ondep ed.
Реэюме
При исследовании ee рассеяния мы покаэываем, что ρ-доминантность абсорбционной части сI=1, вместе со слабостью зкэотических каналов, поэволяет нам вывести, беэ конкретного энания ππ амплитуды сI=0, феноменологически удовлетворительные соотнощения между пороговыми пп параметрами. В частности, мы воспроиэводим «универсальную кривую» Моргана и Що, кваэилинейность субпороговыхs-волновых амплитуд, и определяем величиныp- иd-волновых амплитуд.
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Pennington, M.R. What a dominating ρ and weak exotics can do for ππ scattering near threshold. Nuov Cim A 25, 149–164 (1975). https://doi.org/10.1007/BF02735616
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DOI: https://doi.org/10.1007/BF02735616