Total and differential cross sections for the p p --> p p eta' reaction near threshold.

Khoukaz, A. ; Geck, I. ; Quentmeier, C. ; et al.
Eur.Phys.J.A 20 (2004) 345-350, 2004.
Inspire Record 642580 DOI 10.17182/hepdata.43699

The eta-prime meson production in the reaction pp-->pp eta-prime has been studied at excess energies of Q = 26.5, 32.5 and 46.6 MeV using the internal beam facility COSY-11 at the cooler synchrotron COSY. The total cross sections as well as one angular distribution for the highest Q-value are presented. The excitation function of the near threshold data can be described by a pure s-wave phase space distribution with the inclusion of the proton-proton final state interaction and Coulomb effects. The obtained angular distribution of the eta-prime mesons is also consistent with pure s-wave production.

2 data tables

Total cross section for the reaction P P --> P P ETAPRIME.

Angular distribution of the ETAPRIME in the CM system at an excess energy of 46.6 MeV. There is an additional systematic error of +24%/-35%.


Energy dependence of the near-threshold total cross-section for the p p --> p p eta' reaction.

Moskal, P. ; Adam, H.H. ; Balewski, J.T. ; et al.
Phys.Lett.B 474 (2000) 416-422, 2000.
Inspire Record 522744 DOI 10.17182/hepdata.28036

Total cross sections for the pp --> pp eta' reaction have been measured in the excess energy range from Q = 1.53 MeV to Q = 23.64 MeV. The experiment has been performed at the internal installation COSY-11 using a stochastically cooled proton beam of the COoler SYnchrotron COSY and a hydrogen cluster target. The determined energy dependence of the total cross section weakens the hypothesis of the S-wave repulsive interaction between the eta' meson and the proton. New data agree well with predictions based on the phase-space distribution modified by the proton-proton final-state-interaction (FSI) only.

1 data table

Total cross sections w.r.t the excess energy in the CM system. Statistical errors only are given. As well as the 15 PCT overall systematic uncertainty there is an uncertainty on the energy of 0.44 MeV.