Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Instrumentierung

HK 43.5: Vortrag

Donnerstag, 20. März 2014, 15:15–15:30, HZ 8

Secondary vertex reconstruction with a GEM-TPC at FOPI — •Sverre Dørheim for the GEM-TPC collaboration — Technische Universität München

A Time Projection Chamber (TPC) with GEM amplification was built and installed in the FOPI experiment at GSI, Darmstadt, in the end of 2010, in order to improve vertex and track reconstruction and provide additional information on specific energy loss for particle identification.

After several test runs with cosmic rays and particle beams, it was successfully operated for a three-week physics campaign with a 1.7-GeV π⁻ beam impinging on nuclear targets. The goal of this physics campaign is to investigate strangeness production in nuclear matter. Two important probes in this investigation are Λ and K_S⁰. The reconstruction of such neutral particles relies heavily on the ability to distinguish the decay vertex from the main interaction vertex. Here, the excellent position resolution of the GEM-TPC plays an important role.

I will discuss the reconstruction of secondary decay vertices, including the alignment of the TPC, reconstruction of tracks, particle identification, and vertexing algorithms. First results on yields of Λ and K_S⁰ will be presented.

Supported by the BMBF, the DFG Cluster of Excellence "Universe" and the EU 7th framework program.