Generalized Dalitz plot analysis of the near-threshold pp → pp K + K − reaction in view of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" …

2009; American Institute of Physics; Volume: 80; Issue: 4 Linguagem: Inglês

10.1103/physrevc.80.045202

ISSN

1538-4497

Autores

M. Silarski, P. Moskal, E. Czerwiński, R. Czyżykiewicz, D. T. Gil, D. Grzonka, L. Jarczyk, B. Kamys, A. Khoukaz, J. Klaja, P. Klaja, W. Krzemień, W. Oelert, J. Ritman, T. Sefzick, M. Siemaszko, J. Smyrski, A. Täschner, P. Winter, M. Wolke, P. Wüstner, M. Zieliński, W. Zipper, J. Zdebik,

Tópico(s)

High-Energy Particle Collisions Research

Resumo

The excitation function for the $\mathit{pp}\ensuremath{\rightarrow}\mathit{pp}{K}^{+}{K}^{\ensuremath{-}}$ reaction revealed a significant enhancement close to threshold that may plausibly be assigned to the influence of the ${\mathit{pK}}^{\ensuremath{-}}$ and ${K}^{+}{K}^{\ensuremath{-}}$ final-state interactions. In an improved reanalysis of COSY-$11$ data for the $\mathit{pp}\ensuremath{\rightarrow}\mathit{pp}{K}^{+}{K}^{\ensuremath{-}}$ reaction at excess energies of $Q=10$ and 28 MeV, including the proton-${K}^{\ensuremath{-}}$ interaction, the enhancement is confirmed. Invariant mass distributions for the two- and three-particle subsystems allow us to test at low excess energies the ansatz and parameters for the description of the interaction in the $\mathit{pp}{K}^{+}{K}^{\ensuremath{-}}$ system as derived from the COSY-ANKE data. Finally, based for the first time on the low-energy ${K}^{+}{K}^{\ensuremath{-}}$ invariant mass distributions and the generalized Dalitz plot analysis, we estimate the scattering length for the ${K}^{+}{K}^{\ensuremath{-}}$ interaction to be $|\mathrm{Re}({a}_{{K}^{+}{K}^{\ensuremath{-}}})|={0.5}_{\ensuremath{-}0.5}^{+4.0}$ fm and $\mathrm{Im}({a}_{{K}^{+}{K}^{\ensuremath{-}}})=3.0\ifmmode\pm\else\textpm\fi{}3.0$ fm.

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