2010/09/30 by C. Santamarina Ríos, Cibran Santamarina Rios, Rios, Cibran Santamarina
Computer Science · Physics and Astronomy · #Artificial intelligence #Astrophysics #Atlas (anatomy) #Charm (quantum number) #Computer science #Distributed and Parallel Computing Systems #Event (particle physics) #Large Hadron Collider #Operating system #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Project commissioning #Publishing #Selection (genetic algorithm) #Software #hep-ex #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1009.6222
Contribution to the proceedings of the Hadron Collider Physics 2010 symposium held in Toronto. Three pages and 2 Figures
arxiv created 2010/09/30 · openalex publication_date 2010/09/30 · arxiv updated 2019/08/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Since the start-up of the LHC end of 2009, the trigger commissioning is in full swing. The ATLAS trigger system is divided into three levels: the hardware-based first level trigger, and the software-based second level trigger and Event Filter, collectively referred to as the High Level Trigger (HLT). Initially, events have been selected online based on the Level-1 selections with the HLT algorithms run but not rejecting any events. This has been an important step in the commissioning of these triggers to ensure their correct functioning and subsequently to enable the HLT selections. Due to increasing LHC luminosity and the large QCD cross section, this has been a vital step to select leptons from J/Ψ, bottom, charm, W and Z decays. This presentation gives an overview of the trigger performance of the electron and photon selection. Comparisons of the online selection variables with the offline reconstruction are shown as well as comparisons of data with MC simulations on which the current selection tuning is performed.