Analysing power Ay in the reaction ppol.p->pp eta close to threshold


The reaction ppol.p->pp eta has been studied at an excess energy of Q =40  MeV. The final state has been kinematically completely reconstructed and the analysing power has been determined. Qualitatively thed data seem to favour the calculations with dominant vector meson exchange but definitive conclusions cannot be drawn due to the large uncertainties of the data. To allow a more rigorous comparison with theoretical calculations higher statistics experiments are required and already scheduled for 2002 at COSY-11.

Preprint in PostScript format (370kB)
Publication: Phys.Lett. B 544 (2002) 251-258, Erratum: Phys.Lett. B 553 (2003) 339