Commissioning and Performance of the ATLAS muon, electron, tau and B-physics triggers with 7 TeV collisions at the LHC

In order to cope with the large rate of proton collisions at the LHC, the ATLAS experiment is equipped with a complex three level trigger system, where the first level (L1) is implemented in custom built hardware and the two successive levels (referred together as High Level Triggers - HLT) are software selection algorithms running on large PC farms. Since March 30, 2010, the LHC has been successfully providing 7 TeVproton-proton collisions. These data have been very useful to assess the performance of the ATLAS detector and trigger. During the commissioning phase, firstly, the rejection was applied only at L1 With increasing luminosity the HLT has been activated to efficiently select leptons from J/Psi, bottom, charm, W and Z decays. This contribution focuses on the assessment of the relevant quantities in the muon, electron, tau and Bphysics trigger selection, emphasizing the components which are fundamental in the decision making.