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## An improved determination of the width of the top quark

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An improved determination of the width of the top quark. / Collaboration, D0; Bertram, Iain; Borissov, Guennadi; Fox, Harald; Ross, Anthony; Williams, Mark; Ratoff, Peter.

In: Physical Review D, Vol. 85, No. 9, 091104(R), 04.05.2012.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

### Bibtex

@article{daa489a9302c41ea9c2ce901468c5c3e,
title = "An improved determination of the width of the top quark",
abstract = "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}| 0.59$for a high mass fourth generation bottom quark assuming unitarity of the fourth generation quark mixing matrix.", author = "D0 Collaboration and Iain Bertram and Guennadi Borissov and Harald Fox and Anthony Ross and Mark Williams and Peter Ratoff", note = "{\textcopyright} 2012 American Physical Society 8 pages, 4 figures, submitted to Phys. Rev. D (RC)", year = "2012", month = may, day = "4", doi = "10.1103/PhysRevD.85.091104", language = "English", volume = "85", journal = "Physical Review D", issn = "1550-7998", publisher = "American Physical Society", number = "9", } ### RIS TY - JOUR T1 - An improved determination of the width of the top quark AU - Collaboration, D0 AU - Bertram, Iain AU - Borissov, Guennadi AU - Fox, Harald AU - Ross, Anthony AU - Williams, Mark AU - Ratoff, Peter N1 - © 2012 American Physical Society 8 pages, 4 figures, submitted to Phys. Rev. D (RC) PY - 2012/5/4 Y1 - 2012/5/4 N2 - We present an improved determination of the total width of the top quark,$\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 $|V_{tb}| 0.59$ for a high mass fourth generation bottom quark assuming unitarity of the fourth generation quark mixing matrix.

AB - 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}| 0.59\$ for a high mass fourth generation bottom quark assuming unitarity of the fourth generation quark mixing matrix.

U2 - 10.1103/PhysRevD.85.091104

DO - 10.1103/PhysRevD.85.091104

M3 - Journal article

VL - 85

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 9

M1 - 091104(R)

ER -