Year: 2008
Type: article
Abstract: The differential and total cross sections for kaon pair production in the $\mathit{pp}\ensuremath{\rightarrow}{\mathit{ppK}}^{+}{K}^{\ensuremath{-}}$ 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-J\"ulich accelerator. These near-threshold data are separated into pairs arising from the decay of the \ensuremath{\phi}-meson and the remainder. For the non-\ensuremath{\phi} selection, the ratio of the differential cross sections in terms of the ${K}^{\ensuremath{-}}p$ and ${K}^{+}p$ invariant masses is strongly peaked toward low masses. This effect can be described quantitatively by using a simple ansatz for the ${K}^{\ensuremath{-}}p$ final state interaction, where it is seen that the data are sensitive to the magnitude of an effective ${K}^{\ensuremath{-}}p$ scattering length. When allowance is made for a small number of \ensuremath{\phi} events where the ${K}^{\ensuremath{-}}$ rescatters from the proton, the \ensuremath{\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 ${K}^{\ensuremath{-}}\mathit{pp}$ and ${K}^{+}\mathit{pp}$ invariant masses and the identical final state interaction model is also very successful here. The world data on the energy dependence of the non-\ensuremath{\phi} total cross section is also reproduced, except possibly for the results closest to threshold.
Source: Physical Review C
Authors: Y. Maeda, M. Hartmann, I. Keshelashvili, S. Barsov, M. Büscher, M. Drochner, A. Dzyuba, V. Hejny, A. Kacharava, V. Kleber, H. R. Koch, V. Koptev, P. Kulessa, B. Lorentz, T. Mersmann, S. Mikirtytchiants, A. Mussgiller, M. Nekipelov, H. Ohm, D. Prasuhn, R. Schleichert, H. J. Stein, H. Ströher, Yu. Valdau, C. Wilkin, P. Wüstner
Institutions: Research Center for Nuclear Physics, The University of Osaka, The University of Osaka, Forschungszentrum Jülich, Tbilisi State University, Petersburg Nuclear Physics Institute, Friedrich-Alexander-Universität Erlangen-Nürnberg, University of Bonn, Institute of Nuclear Physics, Polish Academy of Sciences, University of Münster, University College London
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1964888682