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Dzhygadlo, S. Jowzaee, T. Sefzick, W. Eyrich, W. Gast, W. Schroeder","submitted_at":"2016-07-16T18:43:37Z","abstract_excerpt":"The $\\vec{p}p \\rightarrow pK^{+}\\Lambda$ reaction has been measured with the COSY-TOF detector at a beam momentum of $2.7\\,\\mathrm{GeV}/c$. The polarized proton beam enables the measurement of the beam analyzing power by the asymmetry of the produced kaon ($A_N^{K}$). This observable allows the $p\\Lambda$ spin triplet scattering length to be extracted for the first time model independently from the final-state interaction in the reaction. The obtained value is $a_{t} = (-2.55 ^{+0.72}_{-1.39} {}_{\\textrm{stat.}} \\pm 0.6_{\\textrm{syst.}} \\pm 0.3_{\\textrm{theo.}})\\mathrm{fm}$. 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Gillitzer, C. Hanhart, COSY-TOF Collaboration: F. Hauenstein, D. Grzonka, E. Borodina, E. Doroshkevich, E. Roderburg, H. Clement, J. Haidenbauer, J. Ritman, K. Ehrhardt, K. Kilian, L. Kober, M. Krapp, M. Mertens, M. R\\\"oder, P. Klaja, P. Moskal, P. Wintz, P. W\\\"ustner, R. Dzhygadlo, S. Jowzaee, T. Sefzick, W. Eyrich, W. Gast, W. Schroeder","submitted_at":"2016-07-16T18:43:37Z","abstract_excerpt":"The $\\vec{p}p \\rightarrow pK^{+}\\Lambda$ reaction has been measured with the COSY-TOF detector at a beam momentum of $2.7\\,\\mathrm{GeV}/c$. The polarized proton beam enables the measurement of the beam analyzing power by the asymmetry of the produced kaon ($A_N^{K}$). This observable allows the $p\\Lambda$ spin triplet scattering length to be extracted for the first time model independently from the final-state interaction in the reaction. The obtained value is $a_{t} = (-2.55 ^{+0.72}_{-1.39} {}_{\\textrm{stat.}} \\pm 0.6_{\\textrm{syst.}} \\pm 0.3_{\\textrm{theo.}})\\mathrm{fm}$. 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