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000841541 005__ 20250129092449.0
000841541 0247_ $$2arXiv$$aarXiv:1709.04547
000841541 0247_ $$2Handle$$a2128/16298
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000841541 0247_ $$2pmid$$apmid:29376676
000841541 037__ $$aFZJ-2017-08585
000841541 1001_ $$0P:(DE-HGF)0$$aAdlarson, P.$$b0$$eCorresponding author
000841541 245__ $$aSpin dependence of {\eta} meson production in proton-proton collisions close to threshold
000841541 260__ $$c2017
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000841541 500__ $$aAccepted for publication in Phys. Rev. Lett    
000841541 520__ $$aTaking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high degree of the polarized proton beam of COSY, the reaction pp{\to} pp{\eta} has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than one order of magnitude with respect to previous results allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q = 15 MeV signaling s wave production with no evidence for higher partial waves. At Q = 72 MeV the data reveals strong interference of P s and P p partial waves and cancellation of (P p) and Ss*Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the {\eta} meson.
000841541 536__ $$0G:(DE-HGF)POF3-612$$a612 - Cosmic Matter in the Laboratory (POF3-612)$$cPOF3-612$$fPOF III$$x0
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000841541 7001_ $$aAugustyniak, W.$$b1
000841541 7001_ $$aBardan, W.$$b2
000841541 7001_ $$aBashkanov, M.$$b3
000841541 7001_ $$aBass, S. D.$$b4
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000841541 7001_ $$0P:(DE-Juel1)131141$$aEngels, Ralf W.$$b14
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000841541 7001_ $$aFohl, K.$$b19
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000841541 7001_ $$aSchatti-Ozerianska, I.$$b66
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