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

Zongjian Cao, W. Y.P. Hwang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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
Volume34
Issue number5
DOIs
StatePublished - Jan 1 1986

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nucleon-nucleon scattering
pions
quarks
antisymmetry
bags
approximation
impulses
baryons
mesons
wave functions
formalism
radii
thresholds

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Importance of quark interchange in pion production via nucleon-nucleon scattering. / Cao, Zongjian; Hwang, W. Y.P.

In: Physical Review C, Vol. 34, No. 5, 01.01.1986, p. 1785-1797.

Research output: Contribution to journalArticle

Cao, Zongjian ; Hwang, W. Y.P. / Importance of quark interchange in pion production via nucleon-nucleon scattering. In: Physical Review C. 1986 ; Vol. 34, No. 5. pp. 1785-1797.
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