  The top-quark pair production cross section in 7 TeV center-of-mass energy
proton-proton collisions is measured using data collected by the CMS detector
at the LHC. The measurement uses events with one jet identified as a
hadronically decaying tau lepton and at least four additional energetic jets,
at least one of which is identified as coming from a b quark. The analyzed data
sample corresponds to an integrated luminosity of 3.9 inverse femtobarns
recorded by a dedicated multijet plus hadronically decaying tau trigger. A
neural network has been developed to separate the top-quark pairs from the
W+jets and multijet backgrounds. The measured value of sigma(ttbar) = 152 +/-
12 (stat.) +/- 32 (syst.) +/- 3 (lum.) pb is consistent with the standard model
predictions.
