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First close-to-threshold measurement of the analysing power A y in the reaction \vec pp \rightarrow pp\eta

Authors:	P Winter H-H Adam A Budzanowski R Czyzykiewicz D Grzonka M Janusz L Jarczyk B Kamys A Khoukaz K Kilian P Kowina T Lister P Moskal W Oelert C Piskor-Ignatowicz T Rozek R Santo G Schepers T Sefzick M Siemaszko J Smyrski S Steltenkamp A Strzalkowski A Täschner M Wolke P Wüstner W Zipper

Institution:	(1) IKP, Forschungszentrum Jülich, D-52425 Jülich, Germany;(2) IKP, Westfälische Wilhelms-Universität, D-48149 Münster, Germany;(3) Institute of Nuclear Physics, PL-31-342 Kraków, Poland;(4) M. Smoluchowski Institute of Physics, Jagellonian University, PL-30-059 Kraków, Poland;(5) ZEL, Forschungszentrum Jülich, D-52425 Jülich, Germany;(6) Institute of Physics, University of Silesia, PL-40-007 Katowice, Poland

Abstract:	At the internal facility COSY-11 a first measurement of the reaction $\vec pp \rightarrow pp\eta$ near the production threshold has been performed. Results for the analysing power will be presented and a comparison with one-meson exchange models will be discussed.Received: 30 September 2002, Published online: 22 October 2003PACS: 12.40.Vv Vector-meson dominance - 13.60.Le Meson production - 13.88. + e Polarization in interactions and scattering - 24.70. + s Polarization phenomena in reactions

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