Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Hadron Structure and Spectroscopy VII
HK 38.1: Group Report
Wednesday, February 28, 2018, 16:30–17:00, HZO 80
Strangeness in pion-nucleus collisions at 1.7 GeV/c — •Joana Wirth for the HADES collaboration — Physik Department, TUM, Garching, Germany — Excellence Cluster "Universe", Garching, Germany
Pion-nucleus reactions allow for detailed investigations of open and hidden strange hadron production which are directly connected to the study of hadron in-medium properties at a well defined nuclear density. Overall, 10 × 107 and 13 × 107 events have been collected with HADES in π−+C and π−+W at pπ−= 1.7 GeV/c, respectively.
In this contribution, we will present results on differential, acceptance and efficiency corrected yields including the following strange hadron: K±,0, Λ and φ.
Special emphasis will be on the study of K− absorption driven by strangeness exchange processes. A direct indication of this effect can be seen by comparing the K−/K+ ratios measured in collisions with heavy targets (W) and lighter ones (C). Further, the contribution of the φ to the K− production will be presented. For the first time also the φ absorption in different nuclei in pion-induced reactions will be discussed providing complementary information to results obtained with photon and proton beams. Besides, the exclusive channel π− + p → K0 + Λ (Λ + p → Λ + p) is investigated to shed light on the repulsive short-range Λ p interaction predicted by theory. A comparative discussion of these results with respect to Au(1.23 GeV/u)+Au collisions measured with HADES will be shown as well.
∗ supported by the DFG cluster of excellence "Origin and Structure of the Universe and SFB 1258"