Role of heavy-meson exchange in pion production near threshold

1993/04/06 by C. J. Horowitz, H. O. Meyer, D. Griegel · 7 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th

paper · pdf · doi:10.1103/physrevc.49.1337

published as Phys.Rev.C49:1337-1346,1994 · 28 Pages, IU-NTC #93-07

arxiv created 1993/04/06 · arxiv updated 2009/12/01

Abstract

Recent calculations of s-wave pion production have severely underestimated the accurately known pp\ensuremath→pp\mathrm\ensuremathπ⁰ 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 \ensuremathσ-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.

Cited by

• Two-pion-exchange and other higher-order contributions to thepp→ppπ0reaction
• Isoscalar Roper(N1440*)excitation in thepp→ppπ0reaction close to threshold
• Meson production in nucleon?nucleon collisions close to the threshold
• Threshold pp→ppπ0 up to one-loop accuracy
• Meson exchange and pion rescattering contributions to the cross section for pp → ppπ0
• Near-thresholdNN→dπreaction in chiral perturbation theory
• Effective field theory calculations of NN → NNπ