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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.

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@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 -