The ATLAS Trigger Menu design for higher luminosities in Run 2

The ATLAS experiment records about 1 kHz of physics collisions, starting from an LHC design bunch crossing rate of 40 MHz. To reduce the large background rate while maintaining a high selection efficiency for rare and Beyond-the-Standard-Model physics events, a two-level trigger system is used. Events are selected based on physics signatures, such as the presence of energetic leptons, photons, jets or large missing energy. A Trigger Menu is the compilation of about 2,000 individual triggers, specifying the selection algorithms to be used during data taking and the rate and bandwidth a given trigger is allocated. Trigger menus also take into consideration the instantaneous luminosity and limitations from the detector readout and offline processing farm. For Run-2, the ATLAS trigger has been enhanced to be able to handle higher instantaneous luminosities (up to $2.0\times10^{34}cm^{-2}s^{-1}$) and to ensure the selection robustness against higher average multiple interactions per bunch crossing.