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The structureless exp(1.8t) behavior of recent pp data for |t|2 GeV², √s=53 GeV, is shown to be in sharp disagreement with dip-structure predictions from popular models of diffraction. Flip amplitudes, real parts, and large-angle effects are quantitatively insufficient to resolve the discrepancy. Modifications of some familiar ideas on diffraction (like eikonalization) seem necessary.
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U. Sukhatme (1977) studied this question.
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