An upper limit on the total width of the top quark at CDF

We present the first direct experimental upper limit on the total decay width of the top quark using 955 pb$^{-1}$ of the Tevatron's $p\bar p$ collisions taken by the CDF II detector at the Fermilab Tevatron. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from the candidate events is fitted to template representing different values of the top quark width. The Feldman-Cousins prescription is used to extract an upper limit on the top quark width at 95$\%$ confidence level for an assumed top quark mass of 175 GeV/c$^2$.