Home > Publications database > Spin dependence of {\eta} meson production in proton-proton collisions close to threshold > print

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005     20250129092449.0
024 7 _ |a arXiv:1709.04547
|2 arXiv
024 7 _ |a 2128/16298
|2 Handle
024 7 _ |a altmetric:25294166
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024 7 _ |a pmid:29376676
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037 _ _ |a FZJ-2017-08585
100 1 _ |a Adlarson, P.
|0 P:(DE-HGF)0
|b 0
|e Corresponding author
245 _ _ |a Spin dependence of {\eta} meson production in proton-proton collisions close to threshold
260 _ _ |c 2017
336 7 _ |a Preprint
|b preprint
|m preprint
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|s 1513776282_31147
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336 7 _ |a Electronic Article
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336 7 _ |a preprint
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336 7 _ |a ARTICLE
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336 7 _ |a Output Types/Working Paper
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500 _ _ |a Accepted for publication in Phys. Rev. Lett
520 _ _ |a Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} pp{\eta} 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 one 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 reveals strong interference of P s and P p partial waves and cancellation of (P p) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the {\eta} meson.
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700 1 _ |a Augustyniak, W.
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700 1 _ |a Bashkanov, M.
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700 1 _ |a Bass, S. D.
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700 1 _ |a Bergmann, F. S.
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700 1 _ |a Berlowski, M.
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700 1 _ |a Calen, H.
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700 1 _ |a Ciepal, I.
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700 1 _ |a Clement, H.
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700 1 _ |a Czerwinski, E.
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700 1 _ |a Demmich, K.
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700 1 _ |a Engels, Ralf W.
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700 1 _ |a Erven, A.
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700 1 _ |a Erven, W.
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700 1 _ |a Eyrich, W.
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700 1 _ |a Fohl, K.
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700 1 _ |a Fransson, K.
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700 1 _ |a Goldenbaum, F.
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700 1 _ |a Goswami, A.
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700 1 _ |a Gullstrom, C. -O.
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700 1 _ |a Heijkenskjold, L.
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700 1 _ |a Hejny, V.
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700 1 _ |a Husken, N.
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700 1 _ |a Jarczyk, L.
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700 1 _ |a Johansson, T.
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700 1 _ |a Kamys, B.
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700 1 _ |a Kemmerling, G.
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700 1 _ |a Khatri, G.
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700 1 _ |a Khoukaz, A.
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700 1 _ |a Khreptak, O.
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700 1 _ |a Kirillov, D. A.
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700 1 _ |a Kistryn, S.
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700 1 _ |a Kleines, H.
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700 1 _ |a Kulessa, P.
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700 1 _ |a Kupsc, A.
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700 1 _ |a Lorentz, B.
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700 1 _ |a Magiera, A.
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700 1 _ |a Marciniewski, P.
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700 1 _ |a Marianski, B.
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700 1 _ |a Moskal, P.
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700 1 _ |a Ohm, H.
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700 1 _ |a Parol, W.
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700 1 _ |a del Rio, E. Perez
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700 1 _ |a Piskunov, N. M.
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700 1 _ |a Prasuhn, D.
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700 1 _ |a Pszczel, D.
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700 1 _ |a Pysz, K.
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700 1 _ |a Pyszniak, A.
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700 1 _ |a Ritman, J.
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700 1 _ |a Roy, A.
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700 1 _ |a Rudy, Z.
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700 1 _ |a Serdyuk, V.
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700 1 _ |a Shwartz, B.
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