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Faddeev calculation of a K- pp quasibound state
N V Shevchenko1, A Gal, J Mares
1Nuclear Physics Institute, 25068 Rez, Czech Republic. shevchenko@ujf.vas.cz
Physical Review Letters
|March 16, 2007
Summary
This study presents the first three-body calculation for K- pp systems, identifying a quasibound state. The findings challenge previous estimates and experimental observations of K- pp interactions.
Area of Science:
- Nuclear Physics
- Particle Physics
- Quantum Mechanics
Background:
- The K- pp system is crucial for understanding strangeness nuclear interactions.
- Previous theoretical models have yielded varying predictions for quasibound states.
Purpose of the Study:
- To perform the first three-body Faddeev calculation for the K- pp system.
- To search for and characterize quasibound states in this system.
- To compare theoretical predictions with existing experimental data.
Main Methods:
- Utilized a genuinely three-body K- NN- piSigmaN coupled-channel Faddeev approach.
- Incorporated main absorptivity in the K- p subsystem by fitting to K- p data near threshold.
Main Results:
- Identified one quasibound state in the K- pp system.
- The state has quantum numbers I=1/2, J{pi}=0-.
- The calculated binding energy is B approximately 55-70 MeV, with a width of Gamma approximately 90-110 MeV.
Conclusions:
- The calculated quasibound state properties differ significantly from prior theoretical estimates.
- The findings are inconsistent with the K- pp --> Lambda p signal reported by the FINUDA collaboration.
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