$Z^0$ boson measurement in the dimuon channel in PbPb collisions with the CMS experiment

The unprecedented center of mass energy available at the LHC offers unique opportunities for studying the properties of the strongly-interacting QCD matter created in PbPb collisions. This QCD matter is created at extreme temperatures, intermediate momentum fractions and large Q2 values. With its high precision, large acceptance for tracking, and a trigger scheme that allows analysis of each minimum-bias PbPb events, CMS is especially suited to measure high-pT dimuons, even in the high multiplicity environment of heavy-ion collisions. Electroweak probes are accessible for the first time in heavy-ion collisions. The Z0 boson is cleanly reconstructed in the dimuon channel with the CMS detector. Precise measurements of Z0 production in heavy-ion collisions can help to constrain the nuclear parton distribution functions (PDF) as well as serve as a standard candle of the initial state in PbPb collisions at the LHC energies. From the PbPb run at $\sgrt{s_{NN}}$ = 2.76 TeV, the inclusive and differential measurements of the Z0 boson yield in the muon decay channel are presented. Making use of the pp reference run at the same center-of-mass energy, the nuclear modification factor, RAA, is calculated. The value of the RAA = 1.03 $\pm$ 25(stat)[+4.0, −5.0](syst) is found to be consistent with the expectation that no modification is observed with respect to next- to-leading order pQCD calculations, scaled by the number of incoherent nucleon-nucleon collisions.