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Studies on the top quark mass measurement in the all-hadronic top-antitop decay channel with ATLAS

Prospects for measuring the top quark mass in the top-antitop all-hadronic channel with the ATLAS detector are investigated. A robust analysis is developed on Monte Carlo simulations at √s= 10 TeV, considering 200 pb -1 of integrated luminosity. The top quark mass is measured by a χ 2 fitting procedure on the reconstructed invariant mass distribution. With a top quark mass of m t MC = 172.5 GeV as input to the simulation, the proposed method yields to a result of m t = 173.4 ± 2.1 stat ± 7.3 sys GeV for a typical pseudo-experiment. The main contribution to the systematic error comes from the jet energy scale uncertainty. Studies on the performance of the jet calibration method used are performed both with Monte Carlo simulations and with first ATLAS data collected for √s= 900 GeV.