Jet Shapes at CMS

The CMS (Compact Muon Solenoid) detector will observe high transverse momentum jets produced in the final state of proton-proton collisions at the center of mass energy of 14 TeV. These data will allow us to measure jet shapes, defined as the fractional transverse momentum distribution as a function of the distance from the jet axis. Since jet shapes are sensitive to parton showering processes they provide a good test of Monte Carlo event simulation programs. In this note we present a study of jet shapes reconstructed using calorimeter energies where the statistics of all distributions correspond to a CMS data set with 10 pb$^{-1}$ of integrated luminosity. We compare the predictions of the Monte Carlo generators PYTHIA and HERWIG++.