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2015 | 127 | 5 | 1531-1532
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Application of Straw Tube Detectors to Hyperon Studies

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A high statistics measurement of the p̅p → pK⁺Λ reaction was done with the COSY-TOF experiment. The proton beam was polarized up to more than 80%, and its momentum was 2.95 GeV/c. The reconstruction of the pK⁺Λ events was done only with the straw tube tracker due to the higher spatial resolution of the straw tube tracker compared to other subdetectors. The Dalitz plot of the pK⁺Λ events was analyzed to understand the reaction mechanism and presented in this paper. The Dalitz plot shows that the COSY-TOF experiment provides complete kinematic coverage of the phase space of this reaction which made it ideal for p̅p → pK⁺Λ reaction analysis. The influence of different physical effects as pΛ final state interaction, excited nucleon states (N*-resonances) and a coupled channel effect of NΣ-pΛ (NΣ cusp effect) produce significant structures in the Dalitz plot. The angular distribution of the particles in the CMS and helicity frame was also presented in this paper.
  • Institute of Physics, Jagiellonian University, St. Łojasiewicza 11, 30-348 Kraków, Poland
  • Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52428 Jülich, Germany
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  • [2] S. Jowzaee, Ph.D. Thesis, Jagiellonian University, Kraków 2014
  • [3] F. Hauenstein, Ph.D. Thesis, University of Erlangen-Nürnberg, 2014
  • [4] M. Roeder, E. Borodina, H. Clement, E. Doroshkevich, R. Dzhygadlo, K. Ehrhardt, A. Erhardt, W. Eyrich, 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, Eur. Phys. J. A 49, 157 (2013), doi: 10.1140/epja/i2013-13157-9
  • [5] S. Abd El-Samad, E. Borodina, K.-Th. Brinkmann, H. Clement, E. Doroshkevich, R. Dzhygadlo, K. Ehrhardt, A. Erhardt, W. Eyrich, H. Freiesleben, W. Gast, A. Gillitzer, D. Grzonka, C. Hanhart, F. Hauenstein, P. Klaja, K. Kilian, M. Krapp, J. Ritman, E. Roderburg, M. Röder, M. Schulte-Wissermann, W. Schroeder, T. Sefzick, G.J. Wagner, P. Wintz, P. Wüstner, Eur. Phys. J. A 49, 41 (2013), doi: 10.1140/epja/i2013-13041-8
  • [6] S. Jowzaee et al., to be published, 2015
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