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Top Pair Production Cross-Section Measurement in the All-Hadronic Channel at CDF and Dzero

Measurements of the ttbar production cross-section at \sqrt{s} = 1.96TeV in proton-antiproton collisions were performed by the CDF and Dzero collaborations using ttbar final states where both W's decay hadronically. Each experiment uses luminosity of about 160pb^-1 of data collected during Run II of the Fermilab Tevatron collider. Beside kinematical observables both experiments take advantage of identifying b-jets based on lifetime tagging. While CDF counts the number of b-tags over background after a cut based analysis, Dzero counts the excess of events after a neural network based kinematical selection and requiring a b-tagged jet. CDF obtains $σ_{ttbar}=7.8+-2.5{stat}^{+4.7}_{-2.3}{syst}; Dzero $σ_{ttbar}=7.7^{+3.4}_{-3.3}{stat}^{+4.7}_{-3.8}{syst}+-0.5{lumi}.