Theoretical investigation of the formation of K-K-pp in high-energy proton-proton collisions
Jul, 2011
8 pages
Published in:
- Phys.Rev.C 84 (2011) 015207
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Abstract: (APS)
We have formulated and calculated the differential cross section for the formation of the simplest double-K¯ nuclear cluster system, K−K−pp, in the reaction process p+p→K++K++Λ*+Λ*→K++K++K−K−pp, where Λ* is a quasibound K−p state corresponding to the Λ(1405) resonance. From a comprehensive study of the calculated effects of the binding and density of K−K−pp on the cross section, we find that the bound-state peak of K−K−pp dominates over the spectrum when and only when the system is dense. This is understood as meaning that the two Λ* doorway particles interact immediately within a short distance, assisted by a large momentum transfer (∼1.8 GeV/c) and a short collision length (∼0.3 fm), which helps to enlarge the Λ*−Λ* sticking into a dense K−K−pp system. This mechanism is similar to that for a single K¯ cluster (K−pp) formation, which has just been proven by a DISTO experiment. The K−K− repulsion causes an energy shift to somewhat lower binding and a reduction in the peak cross section, but does not change the basic character of this reaction.- 21.90.+f
- 21.30.Fe
- 13.75.-n
- 21.45.-v
- p p: inelastic scattering
- K-: bound state
- cluster: (2K- 2p)
- Lambda(1405)
- differential cross section
- mass spectrum: (2K- 2p)
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