Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Elektromagnetische und Hadronische Sonden

HK 9.7: Talk

Monday, March 10, 2008, 18:00–18:15, 1C

Measurement of the in-medium K⁰ inclusive cross section in π⁻-induced reactions at 1.15 GeV/c with FOPI — •mohamed lotfi benabderrahmane for the FOPI collaboration — Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany

Studies of the in-medium properties of hadrons are nowadays one of the significant topics of nuclear and hadron physics. Experimentally, there are two ways of investigating the medium modifications of hadron properties, either employing nucleus-nucleus collisions or using elementary reactions like π⁻-nucleus where hadrons are produced under well controlled conditions.

The FOPI collaboration has carried out an experiment where five targets (C, Al, Cu, Sn and Pb) were irradiated with a pion beam of 1.15 GeV/c momentum. The secondary pion beam was provided by the SIS-18 accelerator at GSI.
Inclusive K⁰-production cross sections are evaluated and compared to the vacuum expectation and modern transport theories. In addition, we present our observation of a significant difference in the phase space population for the K⁰’s produced in the Pb and the C targets which is interpreted as a hint for the presence of a repulsive KN potential in medium.