Measurement of the mass of the top quark
with partially
reconstructed invariant mass in SLTμ b-tagged events
Alice Bridgeman*, Lucio Cerrito+, Ulysses Grundler*,
Tony Liss*,
Xiaojian Zhang*
*University of Illinois Urbana-Champaign
+Queen Mary and University College London
We present a measurement of the
mass of hte top quark using the distribution of invariant mass between
the lepton
from the W decay, and the semileptonic muon from the b-quark decay, in
top anti-top candidate events of the SLT-tagged sample selected from
~2 fb-1 of data. By fitting the invariant mass distribution
to template
histograms derived from the modeling of the background and MC
simulation of top-antitop events, we measure the top mass value of :
The
analysis uses 240 top-candidate events in the invariant mass window of
4--100 GeV/c2 to determine the mass of the top quark, with
minimal dependence on the jet-energy precision calibration and minimal
dependence on precision vertex tracking. The fit uses a one-dimensional
binned-likelihood technique with fixed background, and its associated
uncertainty is considered in the evaluation of the systematic
uncertainties.
Conference Note 9518
Top-antitop
cross section determination
and sample composition.
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The distribution of invariant mass of the data, the expected background, and the best fit determining the measurement's top mass. |
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Sample composition of the top-antitop candidate sample in W+>=3 jets with SLT-b tag (as derived in the cross section measurement analysis). |
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Summary of systematic uncertainties. |
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The background model
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The background model checked in the W+1,2 jets sample against the data |
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The signal-model and background
line-shapes
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The invariant mass line-shape,
including the expected background, simulated with different values of
the top mass
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The correlation between the
mean-value of the invariant mass distribution and the input top mass,
in simulated events including background
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The expected statistical
precision as a function of the true top mass
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Updated by: Lucio Cerrito, 9/9/2008
This page URL: http://www-cdf.fnal.gov/physics/new/top/2008/mass/sltmass/SLTMass.htm