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Résumé

Starting with Upgrade 1 in 2021, LHCb will move to a purely software-based trigger system. Therefore, the new trigger strategy is to process events at the full rate of 30MHz. Given that the increase of CPU performance has slowed down in recent years, the predicted performance of the software trigger currently falls short of the necessary 30MHz throughput. To cope with this shortfall, the Upgrade High Level Trigger currently uses impact parameter cuts on VELO tracks to reduce the amount of tracks which require further processing. The presented work introduces an alternative approach to determine the impact parameter while achieving a more reliable uncertainty prediction than the current method, which could potentially improve the physics quality of these cuts at a later time.

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