Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 73: Heavy Ion Collisions and QCD Phases 10
HK 73.2: Gruppenbericht
Freitag, 27. März 2015, 15:00–15:30, T/HS2
Modification of hadron properties at normal nuclear matter density invested in π-induced reactions: Recent results from FOPI+GEM-TPC. — •Victoria Zinyuk1, Felix Valentin Böhmer3, Sverre Dørheim2, Laura Fabbietti2, Norbert Herrmann1, and Bernhard Ketzer3 for the FOPI collaboration — 1Universität Heidelberg — 2Technische Universität München — 3HISKP Universität Bonn
In compressed baryonic matter the properties of hadrons are believed to alter as a consequence of various non-trivial in-medium effects such as the partial restoration of the spontaneously broken chiral symmetry, the modified baryon-meson couplings and the nuclear potential. In pion-induced reactions the in-medium modifications can be studied at normal nuclear matter density. At ρ=ρ0 the chiral symmetry is expected to be partially restored to ∼ 30%.
The FOPI collaboration has performed fixed target experiments looking at π− + C-, Cu- and Pb-reactions with pπ=1.7 GeV/c. For these experiments the FOPI apparatus was upgraded with a GEM-based Time Projection Chamber(TPC) leading to significant improvement of the vertex resolution and therefore improving the PID capability.
In this presentation we summarize the most recent results on possible modification of the momentum distribution for strange particles such as K+, K−, KS0, Λ0 and φ-mesons.
This work was supported by BMBF 05P12VHFC7 and BMBF 05P12WOCAA.