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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. - PowerPoint PPT Presentation
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The Final State Interaction in the
pp+ (np) and pp+ (Λp) 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
pp +np FSI parameters of the np system very well known
•
ratiospin-singlet
spin-triplet= ?
Motivation
•
pp +np FSI parameters of the np system very well known
•
ratiospin-singlet
spin-triplet= ?
Motivation
Detailed comparison of the andpp +np pp +d
• •
pp +np FSI parameters of the np system very well known
•
ratiospin-singlet
spin-triplet= ?
• pp→K+Λp
FSI parameters of the Λp system can be deduced
Search for strange (S=-1) dibaryons
Motivation
Detailed comparison of the andpp +np pp +d
• •
• •
Data from Nucl. Phys. A 567(1994) 819
F. Hinterberger and A. Sibirtsev, Eur. J. Phys. A 21 (2004) 313
pp→K+Λp
FSI parameters of the Λp system can be deduced
pp→K+Λp
A. Gasparyan, J. Haidenbauer, C. Hanhart and. J. Speth Phys. Rev. C 69 (2004) 034006
Spin average scattering length of -1.5 fm
pp +np FSI parameters of the np system very well known
•
ratiospin-singlet
spin-triplet= ?
• pp→K+Λp
FSI parameters of the Λp system can be deduced
Search for strange (S=-1) dibaryons
Motivation
Detailed comparison of the andpp +np pp +d
• •
• •
pp +np FSI parameters of the np system very well known
•
ratiospin-singlet
spin-triplet= ?
• 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 data for pp +X and pp→K+X
Motivation
Detailed comparison of the andpp +np pp +d
• •
• •
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: = 0.4 mm mrad ( = 0.5 mm ) ~0.1% halo at = 2.5 mm p/p = 510-5
- p vector polarised
- d vector and tensor polarised
0
100
200
300
400
c ou n
ts
1875.3 1875.4 1875.5 1875.6 1875.7 1875.8 1875.9 1876.0
missing mass (MeV/c2)
data292.2 * EXP(-((MM - 1875.63) / (2^(1/2)*0.0976))^2)
σmm=97 KeV
the deuteron peak
102
103
104
c ou n
ts
-10 0 10 20 30 40
Q (MeV)
Uppsala 30 degreeGEM 0 degree
A. Betsch et al.
pp +X
I. Jour. Mod. Phys. A 20 (2005)291
spin triplet, isospin singlet
a= +5.396 fm
r0= 1.726 fm
spin singlet, isospin triplet
a= -23.678 fm
r0= 2.51 fm
Summary
• - High resolution data for the pp +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 + 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