Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Elektromagnetische und Hadronische Sonden

HK 40.4: Talk

Thursday, March 15, 2007, 12:00–12:15, A

Measurement of K⁰ inclusive cross section in π⁻ A reactions with the FOPI detector — •Mohamed Lotfi Benabderrahmane for the FOPI collaboration — Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg

Medium modifications of hadron properties are a key element for understanding the properties of dense hadronic matter and have been investigated in heavy-ion reactions where densities of 2 −3ρ₀ can be reached. Theorectical calculations indicate that already at normal nuclear matter density, the quark condensate drops by 30%. Therefore, π⁻-induced reactions are a tool for studying hadron properties at ρ₀.

Making use of the SIS18 facility at GSI a π⁻ beam with momentum of 1.15 GeV/c was used on five targets (C, Al, Cu, Sn and Pb) to measure strangeness production with the FOPI detector. A comparison of the measured K⁰ inclusive cross section with transport model predictions will be presented. In addition, the ratio of the differential K⁰ cross section in Lead and Carbon and its sensitivity to the K⁰N potential will be discussed.

Supported by BMBF(06HD154) and GSI(HD-HER)