Performance of the ATLAS Trigger Reconstruction for Minimum Bias Events, Missing Transverse Energy and Jets in pp-collisions at √s = 7 TeV

Since the restart of the LHC, ATLAS has successfully recorded data at √s = 0.9 and 7 TeV. The ATLAS trigger strategy realized a step-wise activation of the three level trigger system, starting with hardware-based first-level (L1) triggers and moving with increasing luminosities to the deployment of the software-based high-level triggers (HLT). We will present L1 and HLT triggers and their performance on 7 TeV collision data, whose use case range from the measurements of inelastic charged particle spectra to new physics searches. We will focus on triggers selecting inelastic pp-collisions (minimum bias), missing transverse energies (missing ET ) and jets. Different minimum bias triggers based of central tracking and forward detector components, their efficiencies as well as possible biases are presented. We highlight missing ET triggers, which require the magnitude of the vector sum of all transverse energies to exceed some threshold. While look-up-tables allow fast trigger decisions at L1, the full calorimeter signal is accessed at HLT to make a more precise estimate on missing ET. We also outline the performance of various jet triggers, showing results for inclusive, dijet and multijet efficiencies at L1 and HLT.