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We present the first exclusive observation of the ttbar to hadronic tau +jets decay channel. Using these events from 1.96 TeV ppbar collisions at CDF,we measure the ttbar cross section as well as the top quark mass. Eventsrequire a single hadronic tau, large missing transverse energy, and exactly 4jets of which at least one must be tagged as a b jet. The cross sectionmeasurement is extracted from a Poisson likelihood function based on theobserved number of events and the predicted number of signal and backgroundevents for a given ttbar cross section. The mass is extracted from a likelihoodfit based on per-event probabilities calculated from leading-order signal(ttbar) and background (W+jets) matrix elements.

Measurements of the Top Anti-Top Cross Section and the Top Quark Mass in the Hadronic tau + Jets Decay Channel at CDF