Production of eta mesons in nucleon collisions

Baru, V.; Kudryavtsev, A. E.; Gasparyan, A. M.; Haidenbauer, J.; Hanhart, C.; Speth, J.

doi:10.1103/PhysRevC.67.024002

Journal Article

Production of eta mesons in nucleon collisions

Baru, V.FZJ* ; Gasparyan, A. M.FZJ* ; Haidenbauer, J.FZJ* ; Hanhart, C.FZJ* ; Kudryavtsev, A. E.FZJ* ; Speth, J.FZJ*

2003
Inst. Woodbury, NY

Physical review / C 67(2), 024002 (2003) [10.1103/PhysRevC.67.024002]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1680 doi:10.1103/PhysRevC.67.024002

Abstract: A microscopic calculation of near-threshold eta-meson production in the reaction NN-->NNeta is presented. It is assumed that the eta meson is produced via direct emission and via elementary rescattering processes MN-->etaN of various mesons M=pi, rho, etc. As a novel feature the amplitudes for the latter production mechanism are taken from a multichannel meson-exchange model of the piN system developed by the Julich group which contains explicitly the channels piN, rhoN, etaN, sigmaN, and piDelta. Furthermore, effects of the NN interaction in the final as well as in the initial state are taken into account microscopically. Our results are compared with recent data from the COSY and CELSIUS accelerator facilities. Reasonable agreement with available near-threshold cross section data for the reactions pp-->ppeta, pn-->pneta, and pn-->deta is found.

Keyword(s): nucleon nucleon: inelastic scattering ; eta: hadroproduction ; threshold ; distorted wave Born approximation ; meson nucleon: scattering amplitude ; initial-state interaction ; final-state interaction ; meson: exchange ; coupling constant: (2nucleon eta) ; Feynman graph ; partial wave analysis ; channel cross section: momentum dependence ; numerical calculations: interpretation of experiments ; bibliography ; nucleon nucleon --> 2nucleon eta