Kaon Pair Production in Proton--Proton Collisions

Abstract

The differential and total cross sections for kaon pair production in the pp->ppK+K- reaction have been measured at three beam energies of 2.65, 2.70, and 2.83 GeV using the ANKE magnetic spectrometer at the COSY-Juelich accelerator. These near-threshold data are separated into pairs arising from the decay of the phi-meson and the remainder. For the non-phi selection, the ratio of the differential cross sections in terms of the K-p and K+p invariant masses is strongly peaked towards low masses. This effect can be described quantitatively by using a simple ansatz for the K-p final state interaction, where it is seen that the data are sensitive to the magnitude of an effective K-p scattering length. When allowance is made for a small number of phi events where the K- rescatters from the proton, the phi region is equally well described at all three energies. A very similar phenomenon is discovered in the ratio of the cross sections as functions of the K-pp and K+pp invariant masses and the identical final state interaction model is also very successful here. The world data on the energy dependence of the non-phi total cross section is also reproduced, except possibly for the results closest to threshold.

12 two-column pages, 12 figures, 1 table

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Cited by in corpus (30)

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• The production of K+K- pairs in proton-proton collisions below the phi meson threshold
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• Coupled-channel effects in the pp -> ppK+K- reaction
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• Few-body aspects of the near threshold pseudoscalar meson production
• Combined analysis of the $K^{+}{K}^{-}$ interaction using near threshold $pp\to pp{K}^{+}{K}^{-}$ data
• Preliminary lattice study of the I=1 $K\bar{K}$ scattering length
• Subthreshold and near-threshold kaon and antikaon production in proton-nucleus reactions
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• Near-threshold $\eta$ production in $pp$ collisions
• Testing the Lambda(1520) hyperon in-medium width in near-threshold proton-nucleus reactions
• Strangeness Production at SIS measured with HADES
• Meson-production experiments at COSY-Juelich
• Strangeness Production at COSY
• Strangeness Production in Hadron Reactions
• Phenomenological studies of the low energy dynamics in the $pp{K}^{+}{K}^{-}$ system
• Meson Production at COSY-TOF and COSY-ANKE