We present the first measurement of the mass of the top
quark of tt-bar --> ell nu-bar bb-bar qq-bar events (where ell þ,
mu) selected by identifying jets containing a muon candidate from the
semileptonic decay of heavy-flavor hadrons (soft muon b-tagging). The p
anti-p collision data used corresponds to an integrated luminosity of 2
fb-1 and was collected by the CDF II detector at the Fermilab Tevatron.
The measurement is based on a novel technique exploiting the invariant
mass of a subset of the decay particles, specifically the lepton from
the W boson of the t --> Wb decay, and the muon from a semileptonic
b decay. We fit template histograms, derived from simulation of tt-bar
events and a modeling of the background, to the mass distribution observed
in the data and measure a top quark mass of 180.5 +/- 12.0(stat.) +/-
3.6(syst.) GeV/c2, consistent with the current world average.
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Updated: Tuesday, 2009 September 15 12:24:35 CDT automatically from input from carol picciolo