We present a measurement of the shapes of b-jets using 300
pb-1 of data obtained with the upgraded Collider Detector at Fermilab
(CDF II) in p anti-p collisions at center of mass energy s**(1/2) =
1.96 TeV. This measurement covers a wide transverse momentum range,
from 52 to 300 GeV/c. Samples of heavy-flavor enhanced jets together
with inclusive jets are used to extract the average shapes 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 than
those containing a bb-bar pair from gluon splitting. The measured
b-jet shapes are found to be significantly broader than expected from
the PYTHIA and HERWIG Monte Carlo simulations. This effect may arise
from an underestimation of the fraction of b-jets originating from gluon
splitting in these simulations.
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Updated: Wednesday, 2008 October 22 10:38:39 CDT automatically from input from carol picciolo