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Invariant mass distributions for the pp to p p eta reaction at Q=10 MeV

Moskal, P. ; Czyżykiewicz, R. ; Czerwiński, E. ; et al.

Eur.Phys.J.A 43 (2010) 131-136, 2010.

Inspire Record 839339 DOI 10.17182/hepdata.54192

Proton-proton and proton-eta invariant mass distributions and the total cross section for the pp to pp eta reaction have been determined near the threshold at an excess energy of Q=10 MeV. The experiment has been conducted using the COSY-11 detector setup and the cooler synchrotron COSY. The determined invariant mass spectra reveal significant enhancements in the region of low proton-proton relative momenta, similarly as observed previously at higher excess energies of Q=15.5 MeV and Q= 40MeV.

3 data tables

Table 1

Total cross section determined from the integral of the invariant mass distribution.

Table 2

Distribution of the square of the invariant mass of the proton-proton system.

Table 3

Distribution of the square of the invariant mass of the proton-eta system.

Production of eta' mesons in the p p --> p p eta' reaction at 3.67-GeV/c.

The DISTO collaboration Balestra, F. ; Bedfer, Y. ; Bertini, R. ; et al.

Phys.Lett.B 491 (2000) 29-35, 2000.

Inspire Record 532685 DOI 10.17182/hepdata.31445

The ratio of the total exclusive production cross sections for $\eta\prime$ and $\eta$ mesons has been measured in the $pp$ reaction at $p_{beam}=3.67$ GeV/c. The observed $\eta\prime/\eta$ ratio is $(0.83\pm{0.11}^{+0.23}_{-0.18})\times 10^{-2}$ from which the exclusive $\eta\prime$ meson production cross section is determined to be $(1.12\pm{0.15}^{+0.42}_{-0.31})\mu b$. Differential cross section distributions have been measured. Their shape is consistent with isotropic $\eta\prime$ meson production.

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

Only statistial errors.