Importance of quark interchange in pion production via nucleon-nucleon scattering

Zong Jian Cao, W. Y.P. Hwang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We investigate pion production via nucleon-nucleon scattering, i.e., N+NN+N+, assuming that pion emission takes place effectively at the quark level and that quark-quark interactions are described to a reasonable approximation by one-gluon exchange plus effective one-pion exchange. The six-quark wave function is totally antisymmetried. Consequently, reaction mechanisms may be grouped into several categories: (1) one-nucleon mechanism or the nucleon-only impulse approximation, (2) two-nucleon mechanisms or meson-exchange currents, and (3) reaction mechanisms involving quark interchange. Applying the formalism to the reactions p+pd++ and n+pp+p+-, we find that, for a nucleon radius of greater than 0.8 fm (as measured in the MIT bag model), reaction mechanisms involving quark interchange may be as important as the conventional one-nucleon or two-nucleon reaction mechanisms even near the pion production threshold. This specific result provides a quantitative support of the conclusion reached by Miller and Kisslinger in the hybrid quark-baryon model concerning the necessity of incorporating quark effects in describing pion production or absorption reactions.

Original languageEnglish (US)
Pages (from-to)1785-1797
Number of pages13
JournalPhysical Review C
Issue number5
StatePublished - 1986

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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