Summary
We compute parity-conserving and parity-violating amplitudes for weak nonleptonic and radiative decays of spin one-half hyperons. We employ the pole model and consider the ground-state baryon octet, both 1/2+ and 1/2− excited baryons, and mesons. Our results are that, by usingS-wave amplitudes as an input, one can fit in terms of one parameter both theP-wave amplitudes of nonleptonic decays and the radiative asymmetry and branching ratios.
Riassunto
Si calcolano le ampiezze che conservano la parità e quelle che la violano per i decadimenti deboli non leptonici e radiativi degli iperoni di spin 1/2. Si adopera il modello polare e si considera l'ottetto barionico fondamentale, i barioni eccitati 1/2+ e 1/2− e i mesoni. Si trova che, usando come dati le ampiezze in ondaS, si possono calcolare mediante un solo parametro sia le ampiezze in ondaP dei decadimenti non leptonici che l'asimmetria e i rapporti di decadimento radiativi.
Резюме
Мы вычисляем амплитуды с сохранением и нарушением четности для слабых нелептонных и радиационных распадов гиперонов со спином половина. Мы используем полюсную модель и рассматриваем октет барионов в основном состоянии, возбужденные 1/2+ и 1/2− барионы и мезоны. Используя, как исходные данные,S-волновые амплитуды, можно получить в терминах только одного параметраP-волновые амплитуды для нелептонных распадов, а также асимметрию и отношение ветвей радиационных распадов.
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Nardulli, G. A fresh look at the pole model of weak nonleptonic and radiative hyperon decays. Nuov Cim A 100, 485–505 (1988). https://doi.org/10.1007/BF02789495
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DOI: https://doi.org/10.1007/BF02789495