A Measurement of the ttbar Cross Section and the Top Quark Mass in the Hadronic Tau + Jets Decay Channel at CDF
Presented by Daryl HARE on 9 Aug 2011 from 16:00 to 16:20
Type: Parallel contribution
Session: Top Quark Physics
Track: Top Quark Physics
We present a measurement of the ttbar cross section as well as the first measurement of the top quark mass in hadronic tau + jets events from 1.96 TeV ppbar collisions at CDF. Events require a single lepton identified as a hadronic tau, missing Et, and 4 jets of which at least one must be tagged as a b jet. Both the cross section and the mass are extracted from unbinned likelihood functions. The cross section uses a Poisson likelihood function based on the observed number of events and the predicted number of signal and background events for a given ttbar cross section. The mass is extracted from a likelihood fit is based on per-event probabilities calculated from leading-order signal (ttbar) and background (W+jets) matrix elements. Our goal is to directly identify this final state for the first time at CDF as well as to provide the first measurement of the top quark mass in this decay channel.