Measurement of the $W$ boson polarization in top decay at {CDF} at $\sqrt{s} = 1.8$ TeV

Acosta, D.; Affolder, T.; Albrow, M.G.; Ambrose, D.; Amidei, D.; Anikeev, K.; Antos, J.; Apollinari, G.; Arisawa, T.; Artikov, A.

doi:10.1103/PhysRevD.71.031101

Measurement of the $W$ boson polarization in top decay at {CDF} at $\sqrt{s} = 1.8$ TeV

CDF

Collaboration

Nov, 2004

7 pages

Published in:

Phys.Rev.D 71 (2005) 031101,
Phys.Rev.D 71 (2005) 059901 (erratum)

e-Print:

hep-ex/0411070 [hep-ex]

DOI:

PDG:

{{\mathit F}_{{{{V+A}}}}}

Report number:

FERMILAB-PUB-04-353

Experiments:

FNAL-E-0741

View in:

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Abstract: (arXiv)

The polarization of the

W

boson in

t \to W b

decay is unambiguously predicted by the Standard Model of weak interactions and is a powerful test of our understanding of the

tbW

vertex. The subsequent

W \to l \nu

decay serves as a polarimeter for the

W

, and the invariant mass of the lepton and

b

quark in top decay provides a measurement of the

W

decay angle. In this paper we present a measurement of the decay rate of the W produced from the decay of the top quark in the hypothesis of V+A structure of the tWb vertex. We find no evidence for the non-standard V+A vertex and set a limit on

f_{V+A}

< 0.80 @ 95% confidence level. By combining this result with a complementary observable in the same data, we assign a limit of

f_{V+A}

< 0.61 @ 95% CL.

Note:

7 pages, 3 figures, submitted to PRD-RC

12.15.Ji
12.60.Cn
13.88.+e
14.65.Ha
anti-p p: colliding beams
anti-p p: inclusive reaction
top
quark: pair production
top: decay
final state: dilepton

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Figures(5)

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