An automated tool to facilitate consistent test-driven development of trigger selections for LHCb’s Run 3

18 May 2021, 15:39
13m
Short Talk Online Computing Algorithms

Speaker

Ross John Hunter (University of Warwick (GB))

Description

Upon its restart in 2022, the LHCb experiment at the LHC will run at higher instantaneous luminosity and utilize an unprecedented full-software trigger, promising greater physics reach and efficiency. On the flip side, conforming to offline data storage constraints becomes far more challenging. Both of these considerations necessitate a set of highly optimised trigger selections. We therefore present HltEfficiencyChecker: an automated extension to the LHCb trigger application, facilitating trigger development before data-taking driven by trigger rates and efficiencies. Since the default in 2022 will be to persist only the event's signal candidate to disk, discarding the rest of the event, we also compute efficiencies where the decision was due to the true MC signal, evaluated by matching it to the trigger candidate hit-by-hit. This matching procedure – which we validate here – demonstrates that the distinction between a “trigger” and a “trigger-on-signal” is crucial in characterising the performance of a trigger selection.

Primary authors

Ross John Hunter (University of Warwick (GB)) Olli Lupton Rosen Matev (CERN) Sascha Stahl (CERN) Mika Anton Vesterinen (University of Warwick (GB))

Presentation materials

Proceedings

Paper