München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Heavy-Ion Collisions and QCD Phases IX

HK 48.2: Talk

Thursday, March 21, 2019, 14:30–14:45, HS 15

4D track reconstruction in the CBM experiment — •Valentina Akishina for the CBM collaboration — Goethe-Universität, Frankfurt, Germany

The future heavy-ion Compressed Baryonic Matter (CBM) ex- periment will focus on the measurement of very rare probes at inter- action rates up to 10 MHz with data ow of up to 1 TB/s. The beam will provide free stream of beam particles without bunch structure. That requires full online event reconstruction and selection not only in space, but also in time, so-called 4D event building and selection. One of the most challenging reconstruction parts is the time-based reconstruction of tracks and grouping them into event-corresponding clusters. The core algorithms of the track reconstruction in CBM are Kalman lter and Cellular Automaton (CA) methods, which are used for the track reconstruction and tting. The algorithms are highly op- timised with respect to speed and highly parallelised to be e ciently running online at the many-core architectures of the CBM online farm. The CA track nder algorithm used to reconstruct tracks in the main tracking detector Silicon Tracking System (STS) has been generalized and applied to simultaneous reconstruction of tracks in combined de- tector system STS and Muon Chamber (MuCh). Tests with simulated collisions have been performed. The resulting track reconstruction ef- ciency is at the level of 90%.