Near-threshold η meson production in proton–proton collisions

• Published in: Physics letters. B 2000-02, Vol.474 (1), p.182-187
• Main Authors: Smyrski, J., Wüstner, P., Balewski, J.T., Budzanowski, A., Dombrowski, H., Grzonka, D., Jarczyk, L., Jochmann, M., Khoukaz, A., Kilian, K., Kowina, P., Köhler, M., Lister, T., Moskal, P., Oelert, W., Quentmeier, C., Santo, R., Schepers, G., Seddik, U., Sefzick, T., Sewerin, S., Strzałkowski, A., Wolke, M.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(99)01447-1

The production of η mesons has been measured in the proton-proton interaction close to the reaction threshold using the COSY-11 internal facility at the cooler synchrotron COSY. Total cross sections were determined for eight different excess energies ( ϵ) in the range from ϵ=0.5 MeV to ϵ=5.4 MeV. The energy dependence of the total cross section is well described by the available phase–space volume weighted by FSI factors for the proton–proton and proton– η pairs.