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Final-State Interactions in the Process pp -> pKLambda

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arxiv 1305.0451 v3 pith:2O62M3SX submitted 2013-05-02 nucl-ex

M. Röder , E. Borodina , H. Clement , E. Doroshkevich , R. Dzhygadlo , K. Ehrhardt , A. Erhardt , W. Eyrich
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W. Gast A. Gillitzer D. Grzonka J. Haidenbauer C. Hanhart F. Hauenstein P. Klaja L. Kober K. Kilian M. Krapp M. Mertens J. Ritman E. Roderburg W. Schroeder T. Sefzick A. Sibirtsev P. Wintz P. Wüstner
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keywords lengthplambdascatteringfinal-statefoundinvestigatedpklambdaprocess
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The possibility to determine the pLambda scattering length from the final-state interaction in the reaction pp->pKLambda is investigated experimentally. From a transversely polarized measurement, the K analyzing power (A_N) which, in principle, allows one to extract the spin triplet scattering length is studied. An unexpected energy dependence of the forward/backward symmetric part of A_N is found. The influence of N*-resonances on the pLambda invariant mass spectrum is investigated by exploiting the large acceptance for the process pp->pKLambda->pKppi and is found to be the main source of uncertainty for determining the pLambda scattering length.

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