Abstract
The Compressed Baryonic Matter experiment (CBM) will investigate strongly interacting matter at high net-baryon densities by measuring nucleus-nucleus collisions at the FAIR research centre in Darmstadt, Germany. Its ambitious aim is to measure at very high interaction rates, unprecedented in the field of experimental heavy-ion physics so far. This goal will be reached with fast and radiation-hard detectors, self-triggered read-out electronics and streaming data acquisition without any hardware trigger. Collision events will be reconstructed and selected in real-time exclusively in software. This puts severe requirements to the algorithms for event reconstruction and their implementation. We will discuss some facets of our approaches to event reconstruction in the main tracking device of CBM, the Silicon Tracking System, covering local reconstruction (cluster and hit finding) as well as track finding and event definition.
Highlights
The Compressed Baryonic Matter experiment (CBM) (“Compressed Baryonic Matter”) experiment is a dedicated heavy-ion experiment which will be operated at the FAIR facility currently under construction in Darmstadt, Germany [1]
The experimental setup comprises a variety of detector systems arranged in a typical fixed-target geometry (Fig. 1, left): a tracking system (STS) build of silicon micro-strip detectors located inside a dipole magnet for the momentum determination, a time-of-flight detector (TOF) for identification of direct hadrons, a ring-imaging Cherenkov detector (RICH) and a transition-radiation detector (TRD) for the identification of electrons, and a forward calorimeter (PSD) for event characterisation
We have briefly described some aspects of the reconstruction of tracks and events in the Silicon Tracking System of the CBM experiment
Summary
The CBM (“Compressed Baryonic Matter”) experiment is a dedicated heavy-ion experiment which will be operated at the FAIR facility currently under construction in Darmstadt, Germany [1]. CBM will investigate collisions of heavy nuclei in the beam momentum range pbeam = 3.5 – 12 GeV/nucleon, with the aim to study strongly interacting matter at extreme net-baryon densities [2, 3]. The readout concept of CBM foresees no hardware trigger at all; instead, autonomous front-end electronics will deliver timestamped hit messages on activation by a charged particle crossing the respective detector element. The raw data will be inspected in real time, and event data containing signatures of rare observables will be selected for storage. The required selectivity and the complex nature of the trigger signatures necessitate almost complete reconstruction of tracks and events online
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