$η^{\prime}$ production in proton-proton scattering close to threshold}

Moskal, P.; Balewski, J. T.; Budzanowski, A.; Dombrowski, H.; Goodman, C.; Grzonka, D.; Haidenbauer, J.; Hanhart, C.; Jarczyk, L.; Jochmann, M.; Khoukaz, A.; Kilian, K.; Köhler, M.; Kozela, A.; Lister, T.; Meißner, U. -G.; Nikolaev, N.; Oelert, W.; Quentmeier, C.; Santo, R.; Schepers, G.; Seddik, U.; Sefzick, T.; Smyrski, J.; Sokołowski, M.; Strzałkowski, A.; Thomas, C.; Wolke, M.; Wüstner, P.; Wyrwa, D.

$η^{\prime}$ production in proton-proton scattering close to threshold}

Authors

Description

The $pp \to pp η^{\prime}$ (958) reaction has been measured at COSY using the internal beam and the COSY-11 facility. The total cross sections at the four different excess energies \mbox{$ Q = ~1.5 ~MeV, ~1.7 ~MeV, ~2.9 ~MeV,$ and $ ~4.1 MeV$} have been evaluated to be \mbox{$ σ= 2.5 \pm 0.5~nb$, $~~~ 2.9 \pm 1.1~nb$, $~~~ 12.7 \pm 3.2~nb$, ~ and $~~~ 25.2 \pm 3.6 ~nb $}, respectively. In this region of excess energy the $η^{\prime}$ (958) cross sections are much lower compared to those of the $π^0$ and $η$ production.
11 pages, 3 figures