ATLAS experiment and particle physics at the LHC energies

Proposed project is part of the extensive research program of the ATLAS experiment at the Large Hadron Collider (LHC), which has successfully started to operate at the end of 2009. Data taking for physics measurements of proton-proton collisions at a centre-of-mass energy of 7 TeV has started in early 2010. The present running period will continue through 2010 and 2011 with the aim to collect data of one inverse femtobarn of integrated luminosity. Within the framework of this project, our efforts will be concentrated on various topics such as detector operation and performance, analysis of SM processes including WW and top-antitop production, as well as direct searches for supersymmetric particles and new gauge bosons. In collaboration with other ATLAS groups with similar research interests, the additional aim of this project is to develop tools and packages which will ensure operation of calorimeter and muon detector with designed performance. Furthermore, cross sections for WW production in lepton channels and for top-antitop production in all hadronic decay channel will be measured. Finally in the case that supersymmetric (SUSY) particles or new gauge bosons such as W' and Z' are not discovered, the exclusion mass limits will be extended with respect to the current limits from the Tevatron collider. We expect that proposed research will improve visible participation of our group, in particular our young researchers, within the ATLAS collaboration.