π−-induced production of K0Λ pairs on nuclei at 1.15 GeV/c momentum
Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, Poland
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In this article we present study of π− induced production of K0Λ pairs on nuclei at 1.15 GeV/c momentum. Experiment was performed at FOPI spectrometer in GSI in Germany. In order to differentiate the K0Λ pair production in single-step (π−p → K0Λ) from multi-step (π−N → … → K0Λ) processes, the missing mass (MM) analysis was performed. The spectra of MM for C and Pb targets show two prominent structures at positive (around mp) and negative values. For single-step process π−p → K0Λ a broad peak somewhat the proton mass (mp) was expected and it is observed. The Monte-Carlo simulations of two-step process π−N → R, RN → NK0Λ lead to formation of broad structure at negative MM and positive MM peak close to mp. The evolution of the observed structure can be interpreted as increase of the role of multi-step process with the target mass.
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