Top quarks in the $l$+jets channel in PbPb collisions

A feasibility study of the measurement of the $t\bar{t}$ production cross section using the lepton + jets channel in lead-lead collisions is presented. The data used is collected by the CMS experiment at the CERN LHC at a nucleon-nucleon center-of-mass energy of $\sqrt{S_{NN}} =$ 5.02 TeV. The measurement is performed using exactly one isolated electron or muon candidate and at least four jets. The data sample corresponds to an integrated luminosity of 1618 $\mu b^{-1}$. The W invariant mass peak of the two light jets is examined in this analysis.