All-hadronic Top Mass measurement in CDF using matrix element method

We present here a preliminary measurement of the top quark mass in the all-hadronic channel, where both W's decay hadronically. The measurement is performed using 340 pb$^{-1}$ of ppbar collisions at $\sqrt(s)$ = 1.96 TeV with the Collider Detector at Fermilab. The method used employs the matrix element information to weigh each event configuration according to the probability for it to originate from ttbar production and decay at a given top mass. All the event probabilities are multiplied to yield a total likelihood which depends on the top mass. The true top mass is estimated by the value at which the total likelihood is minimized.