Measurement of Jet Nuclear Modification Factor in PbPb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with CMS

High transverse momentum jet production in PbPb and pp collisions at a nucleon-nucleon center-of-mass energy of $5.02~\mathrm{TeV}$ was studied with the CMS detector at the LHC, using a PbPb (pp) data sample corresponding to an integrated luminosity of $404~\mu\mathrm{b}^{-1}$ ($27.4~\mathrm{pb}^{-1}$). Jets are reconstructed using the anti-$k_{t}$ algorithm with 5 radius parameters $R$ between 0.2 and 1.0. The measurements are performed using jets with transverse momentum greater than $200~\mathrm{GeV}$ and in a pseudorapidity window of $|\eta|<2$. To reveal the medium modification of the jet spectra in PbPb collisions, jet nuclear modification factors (R$_{\rm AA}$) are extracted as functions of the PbPb collision centrality and the jet radius parameter. The dependence of jet suppression on $R$ is expected to be sensitive to both the jet energy loss mechanism and also the medium response. These results are also compared to predictions from quenched jet event generators, theoretical models and analytical calculations.