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The first measurement of the top quark pair production cross section in thefully hadronic channel at a center-of-mass energy of $\sqrt s = 7$ TeV ispresented. The measurement has been performed using an integrated luminosity of1.09 fb$^{-1}$, collected with the CMS detector. The reconstruction of the$t\bar t$ candidates is performed after a cut-based event selection using akinematic fit. A data-driven technique is used to estimate the dominantbackground from QCD multijet production. The cross section is determined from afit to the top quark mass. The cross section measurement yields $\sigma(t\bart)=136 \pm 20 (stat.) \pm 40 (sys.) \pm 8 (lumi.)$ pb. This result isconsistent with an independent measurement in the same channel, with themeasurements in other decay channels and with the Standard Model predictions.

Measurement of the ttbar production cross section in the fully hadronic decay channel in pp collisions at 7 TeV