Kaon pair production in proton-proton collisions

Maeda, Y.; Wilkin, C.; Keshelashvili, I.; Kleber, V.; Lorentz, B.; Ströher, H.; Drochner, M.; Hejny, V.; Kulessa, P.; Wüstner, P.; Mussgiller, A.; Koch, H. R.; Nekipelov, M.; Mikirtytchiants, S.; Mersmann, T.; Hartmann, M.; Dzyuba, A.; Büscher, M.; Stein, H. J.; Valdau, Yu.; Koptev, V.; Kacharava, A.; Prasuhn, D.; Barsov, S.; Schleichert, R.; Ohm, H.

doi:10.1103/PhysRevC.77.015204

Journal Article

Kaon pair production in proton-proton collisions

Maeda, Y. ; Hartmann, M.FZJ* ; Keshelashvili, I. ; Barsov, S. ; Büscher, M.FZJ* ; Drochner, M. ; Dzyuba, A. ; Hejny, V.FZJ* ; Kacharava, A. ; Kleber, V. ; Koch, H. R. ; Koptev, V. ; Kulessa, P. ; Lorentz, B. ; Mersmann, T. ; Mikirtytchiants, S. ; Mussgiller, A. ; Nekipelov, M. ; Ohm, H.FZJ* ; Prasuhn, D.FZJ* ; Schleichert, R.FZJ* ; Stein, H. J. ; Ströher, H.FZJ* ; Valdau, Y. ; Wilkin, C. ; Wüstner, P.

2008
Inst. Woodbury, NY

Physical review / C 77(1), 015204 (2008) [10.1103/PhysRevC.77.015204]

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Please use a persistent id in citations: http://hdl.handle.net/2128/9856 doi:10.1103/PhysRevC.77.015204

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-Julich 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 toward 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.

Keyword(s): p p: inelastic scattering ; K: pair production ; Phi(1020): hadroproduction ; Phi(1020): hadronic decay ; mass spectrum: (K+ K-) ; mass spectrum: (p K) ; mass spectrum: (2p K) ; charge: asymmetry ; K- p: final-state interaction ; K- p: scattering length ; channel cross section: energy dependence ; magnetic spectrometer: experimental results ; Juelich COSY PS ; p p --> 2p K+ K- ; 2.65: 2.70: 2.83 GeV