Speaker
Description
Electron and photon triggers covering transverse energies from 5 GeV
to several TeV 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 boson. Dedicated triggers are also used to collect data for
calibration, efficiency and fake rate measurements. The ATLAS trigger
system is divided in a hardware-based Level-1 trigger and a
software-based high-level trigger, both of which were upgraded during
the LHC shutdown in preparation for Run-2 operation. To cope with the
increasing luminosity and more challenging pile-up conditions at a
center-of-mass energy of 13 TeV, the trigger selections at each level
are optimized to control the rates and keep efficiencies high. To
achieve this goal multivariate analysis techniques are used. The ATLAS
electron and photon triggers and their performance with Run 2 data
will be presented.
