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Motivation Experimental technique Results and FSI analysis

The Final State Interaction in the pp p + (np) and pp K + ( Λ p) Reactions R. Siudak Institut für Strahlen- und Kernphysik der Universität Bonn, Bonn, Germany Institute of Nuclear Physics, Cracow, Poland. Motivation Experimental technique Results and FSI analysis. Motivation.

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Motivation Experimental technique Results and FSI analysis

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  1. The Final State Interaction in the ppp+ (np) and ppK+ (Λp) ReactionsR. Siudak Institut für Strahlen- und Kernphysik der Universität Bonn, Bonn, GermanyInstitute of Nuclear Physics, Cracow, Poland Motivation Experimental technique Results and FSI analysis

  2. Motivation pp p+np FSIparametersof the np system very well known

  3. Motivation pp p+np FSIparametersof the np system very well known spin-singlet = ? ratio spin-triplet

  4. pp p+np spin-singlet = ? spin-triplet

  5. Motivation pp p+np FSIparametersof the np system very well known spin-singlet = ? ratio spin-triplet Detailed comparison of the and pp p+np pp p+d

  6. Motivation pp p+np FSIparametersof the np system very well known spin-singlet = ? ratio spin-triplet Detailed comparison of the and pp p+np pp p+d pp→K+Λp FSI parameters of the Λp system can be deduced Search for strange (S=-1) dibaryons

  7. pp→K+Λp FSI parameters of the Λp system can be deduced Data from Nucl. Phys. A 567(1994) 819 F. Hinterberger and A. Sibirtsev, Eur. J. Phys. A 21 (2004) 313

  8. pp→K+Λp

  9. pp→K+Λp Spin average scattering length of -1.5 fm • A. Gasparyan, J. Haidenbauer, C. Hanhart and. J. Speth • Phys. Rev. C 69 (2004) 034006

  10. Motivation pp p+np FSIparametersof the np system very well known spin-singlet = ? ratio spin-triplet Detailed comparison of the and pp p+np pp p+d pp→K+Λp FSI parameters of the Λp system can be deduced Search for strange (S=-1) dibaryons

  11. Motivation pp p+np FSIparametersof the np system very well known spin-singlet = ? ratio spin-triplet Detailed comparison of the and pp p+np pp p+d pp→K+Λp FSI parameters of the Λp system can be deduced Search for strange (S=-1) dibaryons Unique combination of the COSY cooled proton beam and the spectrograph Big Karl can deliver high resolution datafor pp p+X and pp→K+X

  12. Cooler Synchrotron COSY w Juelich • up to 3.6 GeV/c • e and stochastic cooling, • luminosity achieved: • L = 1032 cm-2s-1 • p and d beams • (cooled) beam quality: • e = 0.4 p mm mrad (  = 0.5 mm ) • ~0.1% halo at  = 2.5 mm • Dp/p = 510-5 • p vector polarised • d vector and tensor polarised

  13. the deuteron peak σmm=97 KeV

  14. pp p+X A. Betsch et al.

  15. spin triplet, isospin singlet a= +5.396 fm r0= 1.726 fm spin singlet, isospin triplet a= -23.678 fm r0= 2.51 fm I. Jour. Mod. Phys. A 20 (2005)291

  16. Detailed comparison of the pp p+np and pp  p+d

  17. pp→p+np

  18. pp p+pn1 GeV A. Boduard et al. pp p+X pd p X -.-.-.- spin-triplet ….... spin-singlet

  19. Detailed comparison of the pp p+np and pp  p+d D –state effects for pp p+d D –state effects for pp p+np ?

  20. Detailed comparison of the pp p+np and pp  p+d D –state effects for pp p+d D –state effects for pp p+np ?

  21. GEM unpublished R GEM GEM unpublished Pleydon et al. Tp (GeV) R

  22. pp→K+Λp Pbeam =2735 MeV/c pBK = 1070 MeV/c Py (MeV/c) pz(MeV/c)

  23. p(p,X) Pbeam =2735 MeV/c pBK = 1070 MeV/c

  24. Θ = 0 deg MM=350 keV

  25. Summary - High resolution data for the pp p+X and pp K+ X reactions were measured Unique combination of the COSY cooled proton beam and the spectrograph Big Karl provides excellent resolution in np and Λp excitation energy - The reaction pp p+ np is dominated by the spin-triplet contribution to the (np) FSI - Upper limit of possible singlet contribution was deduced - Hypothesis of the importance of the D-state in the np system Data analysis for the pp→K+X reaction in progress

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