Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Instrumentation XIII

HK 58.2: Vortrag

Donnerstag, 13. März 2025, 18:00–18:15, SR Exp1A Chemie

Performance of hit, track, and vertex reconstruction of the Silicon Tracking System of the CBM experiment — •Dario Alberto Ramirez Zaldivar for the CBM collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

The Compressed Baryonic Matter (CBM) experiment is one of the experimental pillars at the Facility for Antiproton and Ion Research (FAIR). The Silicon Tracking System (STS) is the core detector for track reconstruction and momentum measurement. It comprises approximately 900 double-sided silicon strip sensors with 1024 strips per side, arranged in 8 tracking stations in a magnetic field of 1 Tm.

The mCBM setup at SIS18/GSI (mCBM@SIS18) is a small-scale precursor of the full CBM experiment. It consists of pre-series productions of all major detector subsystems, aiming to verify CBM’s free-streaming readout electronics, data transport, and online reconstruction. The mini-STS (mSTS) setup consists of 12 sensors arranged in 3 stations and no magnetic field.

Heavy ion collisions in the 1−2 AGeV/c range were measured with an average collision rate of 500 kHz. The primary and secondary vertexes are reconstructed. Hit reconstruction efficiency is estimated using correlations with downstream detectors. This contribution will present the performance of hit, track, and vertex reconstruction from measurements of heavy ion collisions.

Keywords: Vertex; Tracking; Event; STS; CBM