Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1993-04-06
Phys.Rev.C49:1337-1346,1994
Physics
Nuclear Physics
Nuclear Theory
28 Pages, IU-NTC #93-07
Scientific paper
10.1103/PhysRevC.49.1337
Recent calculations of $s$-wave pion production have severely underestimated the accurately known $pp\rightarrow pp\pi^0$\ total cross section near threshold. In these calculations, only the single-nucleon axial-charge operator is considered. We have calculated, in addition to the one-body term, the two-body contributions to this reaction that arise from the exchange of mesons. We find that the inclusion of the scalar $\sigma$-meson exchange current (and lesser contributions from other mesons) increases the cross section by about a factor of five, and leads to excellent agreement with the data. The results are neither very sensitive to changes in the distorting potential that generates the $NN$ wave function, nor to different choices for the meson-nucleon form factors. We argue that $pp\rightarrow pp\pi^0$\ data provide direct experimental evidence for meson-exchange contributions to the axial current.
Griegel D.
Horowitz Charles J.
Meyer Hans-Otto
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