Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Schwerionenkollisionen und QCD Phasen II
HK 8.1: Group Report
Monday, March 21, 2011, 16:30–17:00, HS AP
Strange baryon production in heavy-ion collisions at SIS. — •Krzysztof Wisniewski — Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg
Although it is not yet quite clear how kaons and antikaons change their properties in the nuclear medium, it has been recently speculated that the dense objects formed from antikaons and nucleons, so called dense kaonic clusters, can be produced, for example, in collisions of heavy ions at SIS energies. In order to understand this phenomena, not only production of strange mesons, e.g., kaons and antikaons, has to be studied in such collisions. Because dense kaonic clusters should predominantly decay into pairs of a hyperon and a nuclear fragment, production of strange baryons in heavy-ion collisions has attracted much interest in the recent years again.
In this group report, we present results of the analysis of correlations between Λ hyperons and other products of collisions of different systems, from light Al+Al up to heavy Pb+Pb, measured with the FOPI detector at SIS in GSI. In order to examine the possible production of kaonic clusters, correlations between the reconstructed Λ’s and protons and deuterons are studied. The experimental procedure is verified by reconstructing Σ*→Λ + π decays. In addition results on the production of hypertritons, decaying into Λt→3He + π are shown.