Abstract
Inclusive differential cross section and analyzing power in A(d,p)X at 2.1 GeV and for protons at 0° are presented for the targets , , , Ti, and Sn. In addition, data for at 1.25 GeV are also shown. For all targets the cross-section data show a similarity in shape when plotted as a function of q, the proton momentum in the deuteron frame, each target exhibiting a shoulder near q=0.30–0.35 GeV/c. Likewise, values are largely independent of the target’s A value. When compared with higher-energy data for ,p)X, the new results establish the universality of the shoulder over the energy range 1.25–7.4 GeV, as well as the energy independence of . The ,p)X data are compared with the results of a nonrelativistic calculation of the six lowest-order graphs of the process using elastic, on-shell NN amplitudes and the Paris NN potential deuteron wave function. The calculated cross sections have no shoulder at either of the two energies of this experiment; the observed behavior of is reproduced qualitatively only. Comparisons with ,2p) and ,e’p) data are made and various possible origins for the anomalous shoulder discussed, including π rescattering, Δ excitation, and a six quark component in the deuteron.
- Received 17 October 1988
DOI:https://doi.org/10.1103/PhysRevC.39.608
©1989 American Physical Society