  The jet fragmentation function and transverse profile for jets with 25 GeV <
ptJet < 500 GeV and etaJet<1.2 produced in proton-proton collisions with a
center-of-mass energy of 7 TeV are presented. The measurement is performed
using data with an integrated luminosity of 36 pb^-1. Jets are reconstructed
and their momentum measured using calorimetric information. The momenta of the
charged particle constituents are measured using the tracking system. The
distributions corrected for detector effects are compared with various Monte
Carlo event generators and generator tunes. Several of these choices show good
agreement with the measured fragmentation function. None of these choices
reproduce both the transverse profile and fragmentation function over the full
kinematic range of the measurement.
