%0 Journal Article
%A Adlarson, P.
%A Augustyniak, W.
%A Bardan, W.
%A Bashkanov, M.
%A Bass, S. D.
%A Bergmann, F. S.
%A Berłowski, M.
%A Bondar, A.
%A Büscher, M.
%A Calén, H.
%A Ciepał, I.
%A Clement, H.
%A Czerwiński, E.
%A Demmich, K.
%A Engels, R.
%A Erven, A.
%A Erven, W.
%A Eyrich, W.
%A Fedorets, P.
%A Föhl, K.
%A Fransson, K.
%A Goldenbaum, F.
%A Goswami, A.
%A Grigoryev, K.
%A Gullström, C.-O.
%A Heijkenskjöld, L.
%A Hejny, V.
%A Hüsken, N.
%A Jarczyk, L.
%A Johansson, T.
%A Kamys, B.
%A Kemmerling, G.
%A Khatri, G.
%A Khoukaz, A.
%A Khreptak, O.
%A Kirillov, D. A.
%A Kistryn, S.
%A Kleines, H.
%A Kłos, B.
%A Krzemień, W.
%A Kulessa, P.
%A Kupść, A.
%A Kuzmin, A.
%A Lalwani, K.
%A Lersch, D.
%A Lorentz, B.
%A Magiera, A.
%A Maier, R.
%A Marciniewski, P.
%A Mariański, B.
%A Morsch, H.-P.
%A Moskal, P.
%A Ohm, H.
%A Parol, W.
%A Perez del Rio, E.
%A Piskunov, N. M.
%A Prasuhn, D.
%A Pszczel, D.
%A Pysz, K.
%A Pyszniak, A.
%A Ritman, J.
%A Roy, A.
%A Rudy, Z.
%A Rundel, O.
%A Sawant, S.
%A Schadmand, S.
%A Schätti-Ozerianska, I.
%A Sefzick, T.
%A Serdyuk, V.
%A Shwartz, B.
%A Sitterberg, K.
%A Skorodko, T.
%A Skurzok, M.
%A Smyrski, J.
%A Sopov, V.
%A Stassen, R.
%A Stepaniak, J.
%A Stephan, E.
%A Sterzenbach, G.
%A Stockhorst, H.
%A Ströher, H.
%A Szczurek, A.
%A Trzciński, A.
%A Wolke, M.
%A Wrońska, A.
%A Wüstner, P.
%A Yamamoto, A.
%A Zabierowski, J.
%A Zieliński, M. J.
%A Złomańczuk, J.
%A Żuprański, P.
%A Żurek, M.
%T Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold
%J Physical review letters
%V 120
%N 2
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2018-05739
%P 022002
%D 2018
%X Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high polarization degree of the proton beam of COSY, the reaction →pp→ppη has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than 1 order of magnitude with respect to previous results, allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q=15  MeV, signaling s-wave production with no evidence for higher partial waves. At Q=72  MeV the data reveal strong interference of Ps and Pp partial waves and cancellation of (Pp)2 and Ss∗Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the η meson.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:29376676
%U <Go to ISI:>//WOS:000419478800004
%R 10.1103/PhysRevLett.120.022002
%U https://juser.fz-juelich.de/record/856093