Kaon pair production close to threshold
P. Winter, M. Wolke, H.-H. Adam, A. Budzanowski, R. Czyzykiewicz, D., Grzonka, M. Janusz, L. Jarczyk, B. Kamys, A. Khoukaz, K. Kilian, P. Klaja,, P.Moskal, W. Oelert, C. Piskor-Ignatowicz, J. Przerwa, J. Ritman, T. Rozek,, T. Sefzick, M. Siemaszko, J. Smyrski, A. Taschner
TL;DR
This paper reports measurements of kaon pair production near threshold energies, revealing significant cross section enhancements and invariant mass spectrum features that suggest resonance effects.
Contribution
It provides new experimental data on pp->ppK+K- near threshold, highlighting deviations from simple models and indicating possible resonance influences.
Findings
Significant cross section enhancement over phase space expectations
Invariant mass spectra show a pK- system enhancement at low masses
Data suggest possible influence of Lambda(1405) resonance
Abstract
The total cross section of the reaction pp->ppK+K- has been measured at excess energies Q=10 MeV and 28 MeV with the magnetic spectrometer COSY-11. The new data show a significant enhancement of the total cross section compared to pure phase space expectations or calculations within a one boson exchange model. In addition, we present invariant mass spectra of two particle subsystems. While the K+K- system is rather constant for different invariant masses, there is an enhancement in the pK- system towards lower masses which could at least be partially connected to the influence of the Lambda(1405) resonance.
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