TOP QUARK MASS DETERMINATION AT THE ATLAS EXPERIMENT USING EARLY DATA

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The ATLAS experiment will start taking data at the end of 2007. During the very first data taking period it will be possible to make a preliminary measurement of the top quark mass in the semileptonic decay channel of ttbar events. A possible strategy to perform this measurement is presented with particular interest in the role of jet energy scale: a jet calibration algorithm is developed and results are discussed. A detailed discussion of test beam data is also presented together with comparisons of Monte Carlo predicions.