The detailed mechanism of the eta production in pp scattering up to the Tlab = 4.5 GeV

Details The detailed mechanism of the eta production in pp scattering up to the Tlab = 4.5 GeV The detailed mechanism of the eta production in pp scattering up to the Tlab = 4.5 GeV

2004-02-12

arxiv.org/abs/nucl-th/0402040v3

Phys. Scripta 73, 663-671 (2006)

Physics

Nuclear Physics

Nuclear Theory

10 pages, 5 figures, corrected typos in relation (3), changed content (added section with differential cross sections)

Scientific paper

Contrary to very early beliefs, the experimental cross section data for the eta production in proton-proton scattering are well described if pi and only eta meson exchange diagrams are used to calculate the Born term. The inclusion of initial and final state interactions is done in the factorization approximation by using the inverse square of the Jost function. The two body Jost functions are obtained from the S matrices in the low energy effective range approximation. The danger of double counting in the p-eta final state interaction is discussed. It is shown that higher partial waves in meson-nucleon amplitudes do not contribute significantly bellow excess energy of Q=100 MeV. Known difficulties of reducing the multi resonance model to a single resonance one are illustrated.

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