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Measurements of heavy quark production and suppression in ultra-relativisticnuclear collisions probe the interactions of heavy quarks with the hot, densemedium created in the collisions. ATLAS has measured heavy quark production in$\sqrtsnn = 2.76$ \TeV \PbPb collisions via semi-leptonic decays of open heavyflavour hadrons to muons. Results are presented for the per-event muon yield asa function of muon transverse momentum, \pT, over the range of $4 < \pT < 14$\GeV. The centrality dependence of the muon yields is characterized by the"central to peripheral" ratio, \Rcp. Muon production is suppressed byapproximately a factor of two in central collisions relative to peripheralcollisions. Within the experimental errors, the observed suppression isindependent of muon \pT for all centralities.

Open heavy flavour production via semi-leptonic decay muons in lead lead collisions at $\sqrtsnn = 2.76$ \TeV with the ATLAS detector at the LHC