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We present a measurement of the shapes of b-jets using 300 pb-1 of dataobtained with the upgraded Collider Detector at Fermilab (CDF II) in p pbarcollisions at center of mass energy sqrt{s}=1.96 TeV. This measurement covers awide transverse momentum range, from 52 to 300 GeV/c. Samples of heavy-flavorenhanced jets together with inclusive jets are used to extract the averageshapes of b-jets. The b-jets are expected to be broader than inclusive jets.Moreover, b-jets containing a single b-quark are expected to be narrower thanthose containing a b bbar pair from gluon splitting. The measured b-jet shapesare found to be significantly broader than expected from the PYTHIA and HERWIGMonte Carlo simulations. This effect may arise from an underestimation of thefraction of b-jets originating from gluon splitting in these simulations.

Measurement of b-jet Shapes in Inclusive Jet Production in p pbar Collisions at sqrt{s} = 1.96 TeV