Analysing power A_y in the reaction p(pol) p --> p p eta close to threshold

P. Winter , H.-H. Adam , F. Bauer , A. Budzanowski , R. Czyzykiewicz , T. Goetz , D. Grzonka , L. Jarczyk

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A. Khoukaz K. Kilian C. Kolf P. Kowina N. Lang T. Lister P. Moskal W. Oelert C. Quentmeier T. Rozek R. Santo G. Schepers T. Sefzick M. Siemaszko J. Smyrski S. Steltenkamp A. Strzalkowski M. Wolke P. Wuestner W. Zipper ((1)Forschungszentrum Julich (2) Munster U. (3)Hamburg U. (4)Jagellonian U. (5)INP Cracow (6)Silesia U.)

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keywords analysingbeenclosemesonpowerproductionreactionthreshold

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Measurements of the eta meson production with a polarised proton beam in the reaction p(pol) p --> p p eta have been carried out at an excess energy of Q = 40 MeV. The dependence of the analysing power A_y on the polar angle theta^*_q of the eta meson in the center of mass system (CMS) has been studied. The data indicate the possibility of an influence of p- and d-waves to the close to threshold eta production.

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Analysing power A_y in the reaction p(pol) p --> p p eta close to threshold

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