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T: Fachverband Teilchenphysik

T 96: DAQ, Trigger and Electronics IV

T 96.6: Vortrag

Donnerstag, 18. März 2021, 17:15–17:30, Tu

Downstream tracking in the first stage of the upgraded LHCb trigger system — •Lukas Calefice^1,2, Johannes Albrecht¹, and Vladimir Gligorov² — ¹Experimentelle Physik 5, Technische Universität Dortmund — ²Sorbonne Université, LPNHE/CNRS, Paris

The LHCb experiment is undergoing a major upgrade that will allow data taking at a five times higher instantaneous luminosity during the next run of the LHC. The upgrade equips the LHCb detector with a complete set of new tracking detectors to deal with the higher occupancy in the detector and increased radiation damage. Furtermore, the first hardware-based trigger stage will be removed. The LHCb trigger system is therefore redesigned to be able to process the higher data rate and make decisions in real time by moving to a GPU-based solution for a partial online event reconstruction in the first trigger stage.

Decay modes involving particles decaying downstream of the vertex locator can be found throughout the entire LHCb physics program. Particular interest evolved in very rare decays of kaons and the extension of b→ s ll transitions to the baryon sector. Enabling a downstream tracking in the first stage of the upgraded trigger system will show a large impact on the efficiencies of these modes.

This talk will cover the GPU implementation of the downstream tracking algorithm and give an outlook focusing on the implications for rare beauty and strange hadron decays.