High-Level Trigger

Our group is involved in several trigger-related activities, with an emphasis on ATLAS' High-Level Trigger (HLT). They include:

  • the coordination of trigger menus and performance group, and menu development (Dr Christos Leonidopoulos, Dr Antonia Struebig)
  • defining the trigger specifications for the future AthenaMT LHC software framework (Dr Ben Wynne)
  • HLT Monitoring: development of TRP: a trigger-rate visualisation tool (Andreas Sogaard, Neofytos Themistokleous)

In the past, we also worked on these areas:

  • the profiling and optimisation of the Inner-Detector tracking algorithm performance (Dr Andrew Washbrook, Dr Ben Wynne)
  • R&D to explore whether HLT algorithms can run in multi-core architectures, e.g. Xeon Phi or NVIDIA’s GPU (Tim Bristow)
  • the development of a track-based lepton isolation algorithm for the Level-1 Track Trigger Upgrade for Phase 2 (Sebastian Olivares)
  • HLT Monitoring:  optimisation of software performance and migration towards menu-aware, flexible monitoring, and interface with Oracle's SQL database (Xanthe Hoad, Dr Christos Leonidopoulos, Dr Ben Smart)

Internal trigger notes documenting this work:

  • "Trigger Menu in 2017", ATLAS internal note, ATL-COM-DAQ-2017-143

  • "Trigger Menu in 2016", ATLAS internal note, ATL-COM-DAQ-2016-137

  • "Report of the Run-2 B-physics stream task force", ATLAS internal note, ATL-COM-DAQ-2017-044 2017

  • "Proposal for inclusion of di-jet and B-physics triggers in delayed stream for exotic analyses", ATLAS internal note, ATL-COM-DAQ-2016-099

These activities are led by Dr Christos Leonidopoulos and Dr Victoria Martin.