Speaker
Description
The Next-Generation Trigger (NGT) program for the CMS High Level Trigger (HLT) aims at enabling full-rate recording of all the events accepted by the Level-1 Trigger at 750 kHz via a dedicated NGT Scouting stream, performing complete physics event reconstruction with no additional filtering. Reconstructed objects are stored directly in a lightweight NanoAOD format, delivering analysis-ready data at unprecedented throughput while minimizing per-event footprint. To guarantee offline-quality physics performance without storing raw detector information, major advances in HLT reconstruction have been introduced. The Patatrack pixel-tracking upgrade — extended to the first macro-pixel layers of the Outer Tracker — yields higher efficiency across the detector, sharply reduced fake rates, and substantial timing gains by eliminating a full Kalman Filter-based iteration in scouting-like menus. In addition, the streamlined HLT muon chain, based on single L1-seeded Inside-Out tracking with targeted recovery, achieves improved purity and lower computational cost in high-pileup conditions. Together, these developments enable real-time production of offline-quality objects at extreme trigger rates, opening new discovery potential for signatures currently limited by bandwidth.