An Improved determination of the width of the top quark - INSPIRE

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An Improved determination of the width of the top quark

D0

Collaboration

Jan, 2012

8 pages

Published in:

Phys.Rev.D 85 (2012) 091104

e-Print:

1201.4156 [hep-ex]

DOI:

10.1103/PhysRevD.85.091104

PDG:

{\mathit {\mathit t}}

-quark DECAY WIDTH

Report number:

FERMILAB-PUB-12-014-E

Experiments:

FNAL-E-0823

View in:

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Abstract: (arXiv)

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.

Note:

8 pages, 4 figures, submitted to Phys. Rev. D (RC)

12.15.Hh
14.65.Ha
14.65.Jk
top: width: measured
family: 4
top: lifetime
top: pair production
CKM matrix
DZERO
anti-p p: interaction

References(20)

Figures(5)

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