Jet shapes in pp and PbPb collisions at the CMS Experiment

Jet shape measurements are important for many applications. When measured in pp collisions they can be used to constrain generator and showering settings. When measured in PbPb collisions they can be used to probe for distortions from interactions with the hot and dense medium. Fully unfolded jet shape measurements are presented and compared with generator expectations in 7 TeV pp collisions, corresponding to an integrated luminosity of 36~$p\mbox{b}^{-1}$. In addition, first measurement of jet shapes in heavy-ion (PbPb) collisions are presented and compared with observations in 2.76 TeV pp collisions to probe if the jet structure is modified in the medium due to parton energy loss. The PbPb data set collected in 2011 is analyzed, corresponding to an integrated luminosity of 129~$\mu\mbox{b}^{-1}$. The jets are reconstructed with the anti-kT clustering algorithm by utilizing particle-flow objects.