We present the first direct measurement of the top-quark mass
using tt̅ events decaying in the hadronic τ+jets decay channel. Using
data corresponding to an integrated luminosity of 2.2 fb-1 collected
by the CDF II detector in pp̅ collisions at √s=1.96 TeV at the
Fermilab Tevatron, we measure the tt̅ cross section, σtt̅ , and the
top-quark mass, Mtop. We extract Mtop from a likelihood based on per-event
probabilities calculated with leading-order signal and background
matrix elements. We measure σtt̅ =8.8±3.3(stat)±2.2(syst) pb
and Mtop=172.7±9.3(stat)±3.7(syst) GeV/c2.
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Updated: Wednesday, 2012 November 21 11:16:41 CST automatically from input from Stephanie A Schuler