Sub-threshold production of Sigma(1385) baryons in Al _s16 Al collisions at 1.9-A-GeV
Keywords
scattering: heavy ion, aluminum, Sigma(1385): hadroproduction, threshold, Sigma(1385): hadronic decay, mass spectrum: (Lambda pi), mass spectrum: (p pi-), yield: (Sigma(1385) Sigma0 Lambda), model: statistical, quantum molecular dynamics: relativistic, transport theory, magnetic spectrometer: experimental results, Darmstadt SIS, aluminum aluminum --> Sigma(1385), Sigma(1385) --> Lambda anything pi, Lambda --> p pi-, 1.9 GeV/nucleon
Abstract
First measurement of sub-threshold $Sigma$(1385) production is presented. Experimental data are presented for Al_s16Al reactions at 1.9$A$ GeV measured with the FOPI detector at SIS/GSI. The $Sigma$(1385)/$Lambda$ ratio is found to be in good agreement with the transport and statistical model predictions. The results allow for a better understanding of sub-threshold strangeness production and strangeness exchange reaction which is the dominant process for $K^-$ production below and close-to threshold.
