Phenomenology of pp->pp eta reaction close to threshold

Andrzej Deloff (1)

1 Institute for Nuclear Studies - Institute for Nuclear Studies

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 leading3P0->1S0,s partial wave amplitude. Higher partial waves seem to play only a marginal role.

Mots clés: nuclear reactions

Domaines: Physique Nucléaire Théorique [nucl-th]

Andrzej Deloff. Phenomenology of pp->pp eta reaction close to threshold. 2003. ⟨hal-00000619⟩