Phenomenology of pp->pp eta reaction close to threshold

Details Phenomenology of pp->pp eta reaction close to threshold Phenomenology of pp->pp eta reaction close to threshold

2003-09-22

arxiv.org/abs/nucl-th/0309059v1

Phys.Rev. C69 (2004) 035206

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1103/PhysRevC.69.035206

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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