A measurement of the top-quark mass is presented using
Tevatron data from proton-antiproton collisions at center-of-mass energy
√s=1.96 TeV collected with the CDF II detector. Events are selected
from a sample of candidates for production of tt̅ pairs that decay
into the lepton+jets channel. The top-quark mass is measured with an
unbinned maximum likelihood method where the event probability density
functions are calculated using signal and background matrix elements,
as well as a set of parametrized jet-to-parton transfer functions. The
likelihood function is maximized with respect to the top-quark mass, the
signal fraction in the sample, and a correction to the jet energy scale
(JES) calibration of the calorimeter jets. The simultaneous measurement
of the JES correction (ΔJES) amounts to an additional in situ jet
energy calibration based on the known mass of the hadronically decaying
W boson. Using the data sample of 578 lepton+jets candidate events,
corresponding to 3.2 fb-1 of integrated luminosity, the top-quark
mass is measured to be mt=172.4±1.4(stat+ΔJES)±1.3(syst) GeV/c2.
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Updated: Monday, 2012 February 06 15:00:22 CST automatically from input from "Stephanie A. Schuler"