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Effect of the large intermediate masses on the hadronic properties of the photon

Влияние промежуточных состояний с большими массами на адронные свойства фотона

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Il Nuovo Cimento A (1965-1970)

Summary

The theory describing the hadron-mediated photon-nucleus interaction is generalized with the introduction of large-mass intermediate states. It is shown that if the VDM is valid for the photoproduction of large masses, the hadron-mediated photon-nucleus cross-section is proportional to the hadron-nucleus total cross-section also in the presence of large intermediate masses. The theory is applied to the available experiment of photon-nucleus total cross-section between 20 and 185 GeV, and explains the apparent increase of the transparency of the nucleus with the energy.

Riassunto

La teoria che descrive l’interazione fotone-nucleo come mediata da adroni è generalizzata con l’introduzione di stati intermedi di grande massa. Si mostra che se la dominanza vettoriale è valida per la fotoproduzione di grandi masse, la sezione d’urto totale fotone-nucleo è proporzionale alla sezione d’urto totale adrone-nucleo anche in presenza di grandi masse nello stato intermedio. La teoria è applicata ad un esperimento di sezione d’urto totale fotone-nucleo fra 20 e 185 GeV, e spiega l’apparente aumento con l’energia della trasparenza del nucleo.

Резюме

Предлагается обобщение теории, описывающей фотон-ядерные взаимодействия, посредством введения промежуточных состояний с большими массами. Показывается, что если VDM справедлива для фоторождения боляших масс, то фотон-ядерное поперечное сечение пропорционаляно адрон-ядерному полному поперечному сечению при наличии больших промежуточных масс. Предложенная теория применяется к имеющемуся эксперименту по определению фотон-ядерных поперечных сечений в области от 20 до 185 МэВ и обьясняет обнаруженное увеличение прозрачности ядер с энергией.

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Bertocchi, L., Treleani, D. Effect of the large intermediate masses on the hadronic properties of the photon. Nuov Cim A 54, 113–127 (1979). https://doi.org/10.1007/BF02902177

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  • DOI: https://doi.org/10.1007/BF02902177

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