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We present the first direct experimental bound on the total decay width of the top quark, t, using 955□□pb-1 of the Tevatrona's pp- collisions recorded by the Collider Detector at Fermilab. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from these events is fitted to templates representing different values of the top quark width. Using a confidence interval based on likelihood-ratio ordering, we extract an upper limit at 95% C.L. of "t<13.1□□GeV for an assumed top quark mass of 175□□GeV/c2. © 2009 The American Physical Society.

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Physical Review Letters