Forward Differential Cross Sections for the Reactionp+p→d+π+in the Range 3.4 to 12.3 GeV/c

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Abstract
A spark-chamber missing-mass spectrometer was used to measure the differential cross section for the reaction p+p→d+π+ at closely spaced intervals of incident momentum between 3.4 and 12.3 GeV/c and at small c.m. angle. The data confirm the existence of a prominent peak in the forward cross section at Ec.m.≃2.9 GeV and show a hitherto unreported shoulder at Ec.m.≃3.6 GeV. The results make evident the inadequacies of present one-pion-exchange and one-nucleon-exchange models.

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