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Decay modes of ψ and ψ′ from a universal ɛ coupling

Моды распадов ψ и ψ′ иэ универсальной ɛ свяэи

  • Published:
Il Nuovo Cimento A (1971-1996)

Summary

Coupling the ɛ as \(g_\varepsilon T_\mu ^\mu \varepsilon \) to the trace of the usual symmetric energy-momentum tensor we obtain predictions for the decays of ψ and ψ′. If one takes mixing into account, the theory accommodates the observed widthsГ(ψ′ → ψ + π+π) andГ(ψ → ω, ϕ + π+π). A comparison with the e.m. mixing is made. We predict the π+π distribution of the decay ψ′ → ψ + π+π in excellent agreement with experiment. The decays ψ′, ψ → ω, ϕ + K+K are predicted to be negligibly small, whereas ψ′ → 2π+π0 should occur at a level of at least 0.3%.

Riassunto

Accoppiando l’ɛ come \(g_\varepsilon T_\mu ^\mu \varepsilon \) alla traccia del solito tensore simmetrico dell’energia-impulso si ottengono predizioni per i decadimenti di ψ e ψ′. Se si tiene conto della miscela, la teoria ammette le ampiezze osservate Γ(ψ′ → ψ + π+π) e Γ(ψ → ω, φ + π+π). Si fa un paragone con la miscela elettromagnetica. Si predice la distribuzione di π+π del decadimento ψ′ → ψ + π+π in ottimo accordo con gli esperimenti. Si predice che i decadimenti ψ′, ψ → ω, φ + K+K sono trascurabilmente piccoli laddove ψ′ → 2π+π0 dovrebbe avvenire ad un livello di almeno 0.3%.

Реэюме

Свяэывая ɛ в виде \(g_\varepsilon T_\mu ^\mu \varepsilon \) со следом обычного симметричного тенэора знергии-импульса, мы получаем предскаэания для распада ψ и ψ′, С учетом смещивания предложенная теория согласовывает наблюдаемые щирины Γ(ψ′ → ψ+π+π) и Γ(ψ → ω, φ+π+π). Проводится сравнение с злектромагнитным смещиванием. Мы предскаэываем π+π распределение распада ψ′ → ψ+π+π, которое хорощо согласуется с зкспериментом. Предскаэывается, что распады ψ′, ψ → ω, φ + K+K являются пренебрежимо малыми, тогда как распад ψ′ → 2π+π0 должен находиться на уровне, по крайней мере, 0.3%.

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References

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Genz, H., Lang, C.B. Decay modes of ψ and ψ′ from a universal ɛ coupling. Nuov Cim A 32, 513–521 (1976). https://doi.org/10.1007/BF02730214

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  • DOI: https://doi.org/10.1007/BF02730214

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