TY - JOUR
T1 - Role of heavy-meson exchange in pion production near threshold
AU - Horowitz, C. J.
AU - Meyer, H. O.
AU - Griegel, David K.
PY - 1994
Y1 - 1994
N2 - Recent calculations of s-wave pion production have severely underestimated the accurately known pp→ppπ0 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 σ-meson exchange current (and lesser ocntributions from other mesons) increases the cross section by about a factor of 5 and leads to excellent agreement with the data. The results are sensitive neither to changes in the distorting potential that generates the NN wave functions nor to different choices for the meson-nucleon form factors.
AB - Recent calculations of s-wave pion production have severely underestimated the accurately known pp→ppπ0 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 σ-meson exchange current (and lesser ocntributions from other mesons) increases the cross section by about a factor of 5 and leads to excellent agreement with the data. The results are sensitive neither to changes in the distorting potential that generates the NN wave functions nor to different choices for the meson-nucleon form factors.
UR - http://www.scopus.com/inward/record.url?scp=0000678791&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.49.1337
DO - 10.1103/PhysRevC.49.1337
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AN - SCOPUS:0000678791
SN - 0556-2813
VL - 49
SP - 1337
EP - 1346
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 3
ER -