Measurement of nuclear modification of lepton production from heavy flavour decays in Pb-Pb collisions with ALICE at the LHC

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 root s = 7 TeV and Pb-Pb collisions at root s(NN) = 2.76 TeV have been recorded by ALICE at the LHC. We present the preliminary results of lepton p(t) spectra (electrons in vertical bar eta vertical bar < 0.8 and muons in 2.5 < eta < 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.