Measurement of $t\bar{t}$ production cross-section in all-hadronic channel

We present here the measurement of the $t\bar t$ production cross section in the all-hadronic channel, where both $W's$ decay hadronically. The analysis is performed using 311 pb$^{-1}$ of $p\bar p$ collisions collected with a multijet trigger at $\sqrt{s}=1.96$ GeV with the Collider Detector at Fermilab. After the application of an optimized kinematical selection we observe an excess of events with 6 or more jets, including one or more $b$ jets, relative to background expectations. Based on this excess we measure the production cross section $\sigma_{t\bar t}=7.5^{+3.7}_{-2.8}$ pb.