Generalized Dalitz Plot analysis of the near threshold pp-->ppK+K- reaction in view of the K+K- final state interaction
Silarski, M. · Moskal, P. · Czerwinski, E. · Czyzykiewicz, R. · Gil, D. · Grzonka, D. · Jarczyk, L. · Kamys, B. · Khoukaz, A. · Klaja, J. · Klaja, P. · Krzemien, W. · Oelert, W. · Ritman, J. · Sefzick, T. · Siemaszko, M. · Smyrski, J. · Taschner, A. · Winter, P. · Wolke, M. · Wustner, P. · Zielinski, M. · Zipper, W. · Zdebik, J.
Original · EN
The excitation function for the pp→ ppK+K- reaction revealed a significant enhancement close to threshold which may plausibly be assigned to the influence of the pK- and K+K- final state interactions. In an improved reanalysis of COSY-11 data for the pp→ ppK+K- reaction at excess energies of Q = 10 MeV and 28 MeV including the proton-K- interaction the enhancement is confirmed. Invariant mass distributions for the two- and three-particle subsystems allow to test at low excess energies the ansatz and parameters for the description of the interaction in the ppK+K- system as derived from the COSY-ANKE data. Finally, based for the first time on the low energy K+K- invariant mass distributions and the generalized Dalitz plot analysis, we estimate the scattering length for the K+K- interaction to be |Re(aₖ+K-)| = 0.5 + 4.0 -0.5 fm and Im(aₖ+K-) = 3.0 +- 3.0 fm.
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