Speaker
Description
The Real-time Reconstruction Revolution (R3) initiative for the High-Level Trigger (HLT) of the Next Generation Triggers (NGT) project in CMS aims to process all collisions accepted by the Level-1 hardware-based trigger (L1T), in preparation for the Phase-2 upgrade of the HL-LHC and beyond. Central to this effort is the expansion of the HLT data-scouting strategy, in which events are reconstructed and stored in a compact, storage-efficient, and analysis-ready format. This necessitates an in situ processing loop to derive high-quality calibration constants during data taking, as offline reprocessing is not possible. A demonstrator system has been developed within the R3 initiative to prove the feasibility of this approach. It comprises dedicated processing nodes integrated into the current data-acquisition (DAQ) infrastructure and deployed during the ongoing LHC Run 3. Approximately 1% of the incoming RAW data is buffered on SSDs for up to 8 hours, enabling a novel calibration loop to derive enhanced calibration constants that are injected into improved HLT reconstruction algorithms for data reprocessing.
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