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Direct bound on the total decay width of the top quark in pp collisions at sqrt[s]=1.96 TeV
T Aaltonen1, J Adelman, T Akimoto
1Department of Physics, University of Helsinki, FIN-00014, Helsinki, Finland.
Abstract:
We present the first direct experimental bound on the total decay width of the top quark, Gamma(t), using 955 pb(-1) of the Tevatron'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 Gamma(t)<13.1 GeV for an assumed top quark mass of 175 GeV/c(2).
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