Ponente
Sr.
Aleksei Ezhilov
(PNPI)
Descripción
Electron and photon triggers are essential for signal selection in a
wide variety of ATLAS physics analyses to study Standard Model
processes and to search for new phenomena. Final states including
leptons and photons had, for example, an important role in the
discovery and measurement of the Higgs particle. Dedicated triggers
are also used for the collection of J/ψ →e+ e− , W→ eν and QCD
background samples for calibration, efficiency and fake rate
measurements. The ATLAS trigger system is divided in a hardware-based
(Level 1) and two software stages (Level 2 and Event-Filter). During
the LHC Run1 proton-proton data-taking period, the increasing
luminosity and the more challenging pile-up conditions demanded the
optimization of the trigger selections at each level to control rates
and keep efficiencies high. The evolution and performance of the ATLAS
electron and photon triggers in Run1 will be discussed, updates and
plans for the operation during Run 2 starting in 2015 will be
presented.
Autores primarios
Dr.
Francesca Pastore
(Royal Holloway University of London (UK))
Dr.
Joerg Stelzer
(CERN)
Ponencia
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