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

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

2008-06-10

arxiv.org/abs/0806.1699v4

Phys.Rev.D78:072005,2008

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevD.78.072005

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 pbar collisions at center of mass energy sqrt{s}=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 b bbar 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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