ATLAS is one of the high energy experiments to be installed at the Large Hadron Collider (LHC) at CERN. The LHC will generate proton collisions with unprecedented energies of 14 TeV. One of the main goals of the ATLAS program is to discover the Higgs partic le which is directly related to the fundamental nature of matter and the basic forces shaping our universe. Efficient identification of all lepton species is crucial at the LHC. The tau-leptons are the most difficult to identify but they can provide unique and important information. Within the frame of the Standard Model (SM) and the Minimal Super-symmetric Standard Model (MSSM) Higgs boson(s) can decay to tau's with significant branching ratios. Hadronically decaying tau's are also very important discovery signature for the Super-symmetry. In the first year of data taking, the physics program of ATLAS foresees studies of the SM background channels: Z->tau tau and W->tau neutrinos a crucial step towards monitoring and calibrating performance of the detector. Within this project the applicant will develop an algorithm for identification of the hadronically decaying tau's. Their reconstruction is one of the most challenging as it combines information from two distinct sub-detectors, the Inner Detector (ID) a nd the calorimeter, and thus requires the best knowledge of the detector and physics simulations. The host organisation, Institute of Nuclear Physics, is committed in the preparation of the ATLAS ID. The skills acquired by the applicant during EIF with the ATLAS software and gained knowledge of the electromagnetic calorimeter will be extremely valuable for the proposed studies. Merging experience of both groups, of the host institute and of the fellowship institute, represents the possibility for the applicant to train and gain in expertise, become a valuable member of the research group and prepare for a successful participation in the analysis of the early LHC data in spring 2008.
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