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arxiv 1404.5436 v2 pith:FPZIT3ZI submitted 2014-04-22 nucl-ex

Determination of the eta'-proton scattering length in free space

E. Czerwinski , P. Moskal , M. Silarski , S. D. Bass , D. Grzonka , B. Kamys , A. Khoukaz , J. Klaja
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W. Krzemien W. Oelert J. Ritman T. Sefzick J. Smyrski A. Taschner M. Wolke M. Zielinski
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keywords freehighlengthprotonresolutionscatteringspaceadvantage
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Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton-beam of the Cooler Synchrotron COSY we determine the excitation function for the pp --> pp eta' reaction close-to-threshold. Combining these data with previous results we extract the scattering length for the eta'-proton potential in free space to be Re(a_{p eta'}) = 0+-0.43 fm and Im(a_{p eta'}) = 0.37(+0.40)(-0.16) fm.

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