Summary
Radiative decays of tensor and axial mesons are considered in the framework of a previously proposed scheme, where the basic currents ofSU 4 are dominated by vector mesons and exhibit a quark structure asymptotically. Agreement is found with previousSU 3 estimates. The decay rates for ψ′ → γχ1,2 also agree with experiments and nonrelativistic estimates. Conversely, the χ1,2 → γJ/ψ widths have been found smaller by about a factor of two than those obtained in the n.r. bound-state picture. Our results are also compared with those previously obtained for the χ0-meson.
Riassunto
I decadimenti radiativi dei mesoni tensoriali ed assiali sono considerati nell’ambito dello schema precedentemente proposto, dove le correnti diSU 4 sono dominate da mesoni vettoriali e presentano il comportamento asintotico proprio del modello a quark. I risultati sono in accordo con le stime ottenute precedentemente nell’ambito diSU 3. Le larghezze di decadimento per φ′ → γχ1,2 sono anche in accordo con gli esperimenti e le stime non relativistiche. Viceversa le larghezze di decadimento relative a χ1,2 → γJ/ψ sono circa un fattore due più piccole di quelle ottenute nell’usuale schema non relativistico. I risultati sono infine confrontati con quelli ottenuti in precedenza per il mesone χ0.
Реэюме
Рассматриваются радиационные распады тенэорных и аксиальных меэонов в рамках ранее предложенной схемы, в которой преобладают баэисные токиSU 4, благодаря векторным меэонам, и укаэанные токи обнаруживают асимптотически кварковую структуру. Полученные реэультаты согласуются с предыдушимиSU 3 оценками. Интенсивности распада φ′ → γχ1, 2 также согласуются с зкспериментами и нерелятивистскими оценками. Однако щирины χ1,2 → γJ/φ окаэываются меньще, примерно в два раэа, чем щирины, полученные в нерелятиви-сткие картине свяэанных состояний. Нащи реэультаты сравниваются также с реэультатами, полученными ранее для χ0 меэона.
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Greco, M. Radiative decays of 2++ and 1++ mesons. Nuov Cim A 42, 315–329 (1977). https://doi.org/10.1007/BF02862398
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DOI: https://doi.org/10.1007/BF02862398