Abstract
The prospects are presented for a top-quark mass, mtop, measurement in the t¯t → lepton+jets channel via the template method using early ATLAS data. Two variants of the template analysis are presented. A 1-dimensional template analysis which adopts the stabilized top-quark mass variable, mstab top , exploiting the event-by-event ratio of the reconstructed top-quark and W boson masses associated to the hadronically decaying top quark candidate, to minimize the impact of the jet energy scale, JES, uncertainty on mtop. A 2-dimensional analysis which simultaneously extracts mtop and the JES from the data. The latter, making use of b-tagging, as well as of a kinematic fit of the decay products, offers a more precise determination of mtop, while requiring a better understanding of the detector. The 1-d analysis is optimized for very first data with integrated luminosities, Lint, up to 100 pb−1; whereas the 2-d analysis is targeted at Lint of 1 fb−1, the total integrated luminosity currently expected from the ongoing 2010-2011 LHC operations.
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