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Czerwiński, E; Moskal, P; Silarski, M; Bass, S D; Grzonka, D; Kamys, B; Khoukaz, A; Klaja, J; Krzemień, W; Oelert, W; Ritman, J; Sefzick, T; Smyrski, J; Täschner, A; Wolke, M; Zieliński, M
Physical review letters, 08/2014, Volume: 113, Issue: 6Journal Article
Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton beam of the cooler synchrotron COSY, we determine the excitation function for the pp→ppη(') reaction close to threshold. Combining these data with previous results, we extract the scattering length for the η(')-proton potential in free space to be Re(a(pη(')))=0±0.43 fm and Im(a(pη(')))=0.37(-0.16)(+0.40) fm.
