Data Reconstruction for the sPHENIX experiment
November 23, 2022
The sPHENIX detector is a next-generation experiment under construction at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. Starting in 2023 it will collect high statistics data sets from ultra relativistic Au+Au, p+p and p+Au collisions. The readout is a combination of triggered readout for calorimeters and streaming readout for the silicon pixel/strip detectors and the time projection chamber (TPC). sPHENIX does not employ higher level triggers -- only a small subset of events is built online for monitoring purposes -- which makes it unique among NP/HEP experiments. Events are assembled from multiple input streams as part of a multi-pass reconstruction which includes calibration and space charge distortion corrections for the TPC data. This reconstruction will run near realtime within a fixed latency of when the data were taken. To meet its physics requirements, sPHENIX has developed state-of-the-art reconstruction software based on the "A Common Tracking Software" (ACTS) package which was adapted to reconstruct the TPC data. The raw data will be processed at the Tier 0 for the RHIC experiments - the Scientific Data Computing Center (SDCC) at BNL. The Production and Distributed Analysis (PanDA) system was chosen as workload management system to handle the complexities of our workflow.
Here we describe the details of the data processing for the sPHENIX experiment.
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