First Direct Bound on the Total Width of the Top Quark in $p \bar{p}$ Collisions at $\sqrt{s}=$ 1.96-TeV

We present the first direct experimental bound on the total decay width of the top quark using 955pb^-1 of the Tevatron's ppbar 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.

Note:

Submitted to Phys. Rev. Lett

12.15.Ff
14.65.Ha
13.85.Qk
anti-p p: inclusive reaction
top: pair production
top: decay
final state: ((n)jet lepton)
top: width
upper limit
top: mass

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First Direct Bound on the Total Width of the Top Quark in ppˉp \bar{p}ppˉ​ Collisions at s=\sqrt{s}=s​= 1.96-TeV

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First Direct Bound on the Total Width of the Top Quark in $p \bar{p}$ Collisions at $\sqrt{s}=$ 1.96-TeV