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Electron and photon triggers covering transverse energies from 5 GeV toseveral TeV are essential for signal selection in a wide variety of ATLASphysics analyses to study Standard Model processes and to search for newphenomena. Final states including leptons and photons had, for example, animportant role in the discovery and measurement of the Higgs particle.Dedicated triggers are also used to collect data for calibration, efficiencyand fake rate measurements. The ATLAS trigger system is divided in ahardware-based (Level 1) and a software based High-Level Trigger (HLT), both ofwhich were upgraded during the long shutdown of the LHC in preparation for datataking in 2015. The increasing luminosity and more challenging pile-upconditions as well as the higher center-of-mass energy demanded theoptimisation of the trigger selections at each level, to control the rates andkeep efficiencies high. To improve the performance, multivariate analysistechniques were introduced at the HLT. The evolution of the ATLAS electron andphoton triggers and their performance is presented, including initial resultsfrom the early days of the LHC Run 2 operation.

The Upgrade of the ATLAS Electron and Photon Triggers towards LHC Run 2 and their Performance