Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2012-01-19
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 4 figures, submitted to Phys. Rev. D (RC)
Scientific paper
We present an improved determination of the total width of the top quark, $\Gamma_t$, using 5.4 fb$^{-1}$ of integrated luminosity collected by the D0 Collaboration at the Tevatron $p\bar{p}$ Collider. The total width $\Gamma_t$ is extracted from the partial decay width $\Gamma(t\to Wb)$ and the branching fraction $\mathcal{B}(t\to Wb)$. $\Gamma(t\to Wb)$ is obtained from the $t$-channel single top quark production cross section and $\mathcal{B}(t\to Wb)$ is measured in $t\bar{t}$ events. For a top mass of $172.5\;\rm GeV$, the resulting width is $\Gamma_t = 2.00^{+0.47}_{-0.43}$ GeV. This translates to a top-quark lifetime of $\tau_t = (3.29^{+0.90}_{-0.63})\times10^{-25}$ s. We also extract an improved direct limit on the CKM matrix element $0.81 < |V_{tb}| \leq 1$ at 95% C.L. and a limit of $|V_{tb'}| < 0.59$ for a high mass fourth generation bottom quark assuming unitarity of the fourth generation quark mixing matrix.
No associations
LandOfFree
An improved determination of the width of the top quark does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An improved determination of the width of the top quark, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An improved determination of the width of the top quark will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-255028