Abstract
The heavy quark production cross-section and its nuclear modification factor can be measured by identifying single leptons from semi-leptonic heavy flavour hadron decays. In 2010, pp collisions at = 7 TeV and Pb-Pb collisions at = 2.76 TeV have been recorded by ALICE at the LHC. We present the preliminary results of lepton pt spectra (electrons in |η| < 0.8 and muons in 2.5 < η < 4.0) from heavy flavour hadron decays in pp collisions and their nuclear modification factor in Pb-Pb collisions with both the central barrel and forward muon detectors of ALICE.
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