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Phenomenology of pp->pp eta reaction close to threshold
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The recent high statistics measurement of the pp -> pp eta reaction at an excess energy Q=15.5 MeV has been analysed by means of partial wave decomposition of the cross section. Guided by the dominance of the final state 1S0 pp interaction (FSI), we keep only terms involving the FSI enhancement factor. The measured p-p and p-eta effective mass spectra can be well reproduced by lifting the standard on-shell approximation in the enhancement factor and by allowing for a linear energy dependence in the leading 3P0->1S0,s partial wave amplitude. Higher partial waves seem to play only a marginal role.
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Cited by 1 Pith paper
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Exclusive $\eta$ production in proton-proton collisions at energies available at the GSI Facility for Antiproton and Ion Research
A phenomenological model with N(1535) dominance and rho-exchange excitation reproduces existing pp to pp eta data and predicts cross sections for HADES, PANDA, and SIS100.
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