pp→ppω reaction near threshold

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We analyze the total cross section data for pp→ppω ->ppti> near threshold measured recently at SATURNE. Using an effective range approximation for the on-shell pp S-wave final-state interaction, we extract from these data the modulus |Ω|=0.53 fm4 of the threshold transition amplitude Ω. We present a calculation of various (tree-level) meson exchange diagrams contributing to Ω. It is essential that ω emission from the anomalous ωρπ vertex interferes destructively with ω emission from the proton lines. The contribution of scalar σ-meson exchange to Ω turns out to be negligibly small. Without introducing off-shell meson-nucleon form factors the experimental value |Ω|=0.53 fm4 can be reproduced with an ωN-coupling constant of gωN=10.7. The results of the present approach agree qualitatively with the Jülich model. We also perform a combined analysis of the reactions pp→ppπ0, pnπ+, ppη, ppω, pn→pnη near threshold.

Original languageEnglish
Article number057001
Pages (from-to)570011-570014
Number of pages4
JournalPhysical Review C - Nuclear Physics
Issue number5
StatePublished - Nov 1999


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