Production of ${K}^{+}{K}^{\ensuremath{-}}$ pairs in proton-proton collisions below the $\ensuremath{\phi}$ meson threshold

Production of $K^{+} K^{-}$ pairs in proton-proton collisions below the $ϕ$ meson threshold

Q. J. Ye, M. Hartmann, D. Chiladze, S. Dymov, A. Dzyuba, H. Gao, R. Gebel, V. Hejny, A. Kacharava, B. Lorentz, D. Mchedlishvili, S. Merzliakov, M. Mielke, S. Mikirtytchiants, H. Ohm, M. Papenbrock, A. Polyanskiy, V. Serdyuk, H. J. Stein, H. Ströher, S. Trusov, Yu. Valdau, C. Wilkin, and P. Wüstner

Phys. Rev. C 87, 065203 – Published 12 June 2013

Abstract

The $p p \to p p K^{+} K^{-}$ reaction was measured below the $ϕ$ threshold at a beam energy of 2.568 GeV using the COSY-ANKE magnetic spectrometer. By assuming that the four-body phase space is distorted only by the product of two-body final-state interactions, fits to a variety of one-dimensional distributions permit the evaluation of differential and total cross sections. The shapes of the distributions in the $K p$ and $K p p$ invariant masses are reproduced only if the $K^{-} p$ interaction is even stronger than that found at higher energy. The cusp effect in the $K^{+} K^{-}$ distribution at the $K^{0} {\bar{K}}^{0}$ threshold is much more clear and some evidence is also found for coupling between the $K^{-} p$ and ${\bar{K}}^{0} n$ channels. However, the energy dependence of the total cross section cannot be reproduced by considering only a simple product of such pairwise final-state interactions.

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Received 28 February 2013

DOI:https://doi.org/10.1103/PhysRevC.87.065203

Authors & Affiliations

Q. J. Ye^1,2,*, M. Hartmann^2,†, D. Chiladze^2,3, S. Dymov^4,5, A. Dzyuba⁶, H. Gao¹, R. Gebel², V. Hejny², A. Kacharava², B. Lorentz², D. Mchedlishvili^2,3, S. Merzliakov^2,5, M. Mielke⁷, S. Mikirtytchiants^2,6, H. Ohm², M. Papenbrock⁷, A. Polyanskiy^2,8, V. Serdyuk^2,5, H. J. Stein², H. Ströher², S. Trusov^9,10, Yu. Valdau^2,11, C. Wilkin¹², and P. Wüstner¹³

¹Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA
²Institut für Kernphysik and Jülich Centre for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
³High Energy Physics Institute, Tbilisi State University, GE-0186 Tbilisi, Georgia
⁴Physikalisches Institut, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
⁵Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, RU-141980 Dubna, Russia
⁶High Energy Physics Department, Petersburg Nuclear Physics Institute, RU-188350 Gatchina, Russia
⁷Institut für Kernphysik, Universität Münster, D-48149 Münster, Germany
⁸Institute for Theoretical and Experimental Physics, RU-117218 Moscow, Russia
⁹Institut für Kern- und Hadronenphysik, Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
¹⁰Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, RU-119991 Moscow, Russia
¹¹Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany
¹²Physics and Astronomy Department, UCL, London WC1E 6BT, United Kingdom
¹³Zentralinstitut für Elektronik, Forschungszentrum Jülich, D-52425 Jülich, Germany

^*qy4@phy.duke.edu
^†m.hartmann@fz-juelich.de

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Vol. 87, Iss. 6 — June 2013

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Physical Review C

covering nuclear physics

Production of $K^{+} K^{-}$ pairs in proton-proton collisions below the $ϕ$ meson threshold

Q. J. Ye, M. Hartmann, D. Chiladze, S. Dymov, A. Dzyuba, H. Gao, R. Gebel, V. Hejny, A. Kacharava, B. Lorentz, D. Mchedlishvili, S. Merzliakov, M. Mielke, S. Mikirtytchiants, H. Ohm, M. Papenbrock, A. Polyanskiy, V. Serdyuk, H. J. Stein, H. Ströher, S. Trusov, Yu. Valdau, C. Wilkin, and P. Wüstner

Phys. Rev. C 87, 065203 – Published 12 June 2013

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Physical Review C

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Production of K+K− pairs in proton-proton collisions below the ϕ meson threshold

Phys. Rev. C 87, 065203 – Published 12 June 2013

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Production of $K^{+} K^{-}$ pairs in proton-proton collisions below the $ϕ$ meson threshold