On new predictions of the vector-meson dominance model for the reactions πN → ?0N and γN → πN |
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| Authors: | NN Achasov GN Shestakov |
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| Institution: | Department of Theoretical Physics, Institute of Mathematics, USSR Academy of Sciences, Siberian Division, Novosibirsk 90, USSR |
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| Abstract: | It is shown that the assumption of pole vector-meson dominance for the Ball invariant amplitude having a π-meson pole is sufficient for reproducing the longitudinal amplitude of ?0-production by the photoproduction amplitude at |t| < 0.1 (GeV/c)2. The strong k2-dependence of the Ball invariant amplitude without the π-meson pole has been found by the deviations of theoretical predictions obtained in the VDM framework for the longitudinal ?0-production amplitude from the experimental data in the region |t| > 0.1 (GeV/c)2. A natural explanation of the k2-dependence in the one-pion exchange model with absorption is given. The problem of A2-exchange is discussed. |
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