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The bremsstrahlung diagrams with the emission of the (Formula presented) meson are neglected because the intermediate pion is far from mass shell, so their contribution grows with energy much more slowly as compared to the pointlike vertex. In any case, taking them into account seems to be premature since, as is evident from Fig. 11, the contribution of the right shoulder of the (Formula presented) peak in the (Formula presented) channel is much lower than the contribution of the (Formula presented) resonances
-
The bremsstrahlung diagrams with the emission of the (Formula presented) meson are neglected because the intermediate pion is far from mass shell, so their contribution grows with energy much more slowly as compared to the pointlike vertex. In any case, taking them into account seems to be premature since, as is evident from Fig. 11, the contribution of the right shoulder of the (Formula presented) peak in the (Formula presented) channel is much lower than the contribution of the (Formula presented) resonances.
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This effect is completely analogous to the well-known quantum-mechanical repulsion of two levels under the action of perturbation
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This effect is completely analogous to the well-known quantum-mechanical repulsion of two levels under the action of perturbation.
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The data on the reaction (Formula presented), M. Atkinson et al., Z. Phys. C 26, 499 (1985), point to the negligible coupling of the (Formula presented) to the (Formula presented) state. However, when comparing them with the results of the present analysis, one should have in mind that, first, the mechanism of photoproduction as compared to the (Formula presented) annihilation, includes an additional uncertainty related to the moduli and the phases of the (Formula presented), (Formula presented) and (Formula presented) couplings to the Pomeron, which, in fact, does not permit one to establish a meaningful (Formula presented). Second, the data of Atkinson et al. are analyzed in terms of the single (Formula presented) resonance which corresponds to the (Formula presented) in the picture of two (Formula presented) resonances. The latter also has the coupling with the (Formula presented) states whose value does not contradict zero
-
The data on the reaction (Formula presented), M. Atkinson et al., Z. Phys. C 26, 499 (1985), point to the negligible coupling of the (Formula presented) to the (Formula presented) state. However, when comparing them with the results of the present analysis, one should have in mind that, first, the mechanism of photoproduction as compared to the (Formula presented) annihilation, includes an additional uncertainty related to the moduli and the phases of the (Formula presented), (Formula presented) and (Formula presented) couplings to the Pomeron, which, in fact, does not permit one to establish a meaningful (Formula presented). Second, the data of Atkinson et al. are analyzed in terms of the single (Formula presented) resonance which corresponds to the (Formula presented) in the picture of two (Formula presented) resonances. The latter also has the coupling with the (Formula presented) states whose value does not contradict zero.
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