Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-04-22
Phys.Rev.C79:061001,2009
Physics
Nuclear Physics
Nuclear Experiment
10 pages, 3 figures
Scientific paper
10.1103/PhysRevC.79.061001
Inclusive measurements of pion production in proton--proton collisions in the forward direction were undertaken at 400 and 600 MeV at COSY using the Big Karl spectrograph. The high resolution in the $\pi^+$ momentum ensured that there was an unambiguous separation of the $pp\to {\pi}^+d/\pi^+pn$ channels. Using these and earlier data, the ratio of the production cross sections could be followed through the $\Delta$ region and compared with the predictions of final state interaction theory. Deviations are strongly influenced by long-range terms in the production operator and the tensor force in the final $pn$ system. These have been investigated in a realistic $pp\to\pi^+d/\pi^+pn$ calculation that includes $S \rightleftharpoons D$ channel coupling between the final nucleons. A semi-quantitative understanding of the observed effects is achieved.
Budzanowski Andrzej
Chatterjee Arnab
Hawranek P.
Jahn Reinhold
Jha Vandana
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