Generalized Dalitz plot analysis of the near-thresholdpp→ppK+K−reaction in view of theK+K−final state interaction

• DOI: 10.1103/physrevc.80.045202
• Publication Date: 2009-10-12T10:34:22Z
• Authors: M. Silarski; P. Moskal; E. Czerwiński; R. Czyżykiewicz; D. 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
• Keywords: Dalitz plot

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