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The improvement in the agreement between theory and experiment in the threshold region of π + -meson production from proton-proton collisions is shown to be independent of any detailed model of the meson-nucleon interaction in the final state. The distorted wave approximation applied to the resonant scattering state gives a marked increase in the production cross section over the cross section calculated in Born approximation.
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B. R. Durney (1958) studied this question.
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