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Phys. Rev. D 78, 072005 (2008) [17 pages]

Measurement of b-jet shapes in inclusive jet production in pp̅ collisions at s=1.96  TeV

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T. Aaltonen et al. CDF Collaboration
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Received 11 June 2008; published 20 October 2008

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 pp̅ collisions at center-of-mass energy 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 bb̅ 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. The jet shape distributions provided in this paper could be compared to any full Monte Carlo simulation and could be used to further constrain the various parameters.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.78.072005
DOI:
10.1103/PhysRevD.78.072005
PACS:
12.38.Qk, 14.65.Fy