Measurement of W-Boson Polarization in Top-quark Decay in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV - INSPIRE

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Measurement of W-Boson Polarization in Top-quark Decay in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV

CDF

Collaboration

Mar, 2010

8 pages

Published in:

Phys.Rev.Lett. 105 (2010) 042002

e-Print:

1003.0224 [hep-ex]

DOI:

10.1103/PhysRevLett.105.042002

PDG:

{{\mathit F}_{{{0}}}}

Report number:

FERMILAB-PUB-10-041-E

Experiments:

FNAL-E-0830

View in:

reference search67 citations

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Abstract: (arXiv)

We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb^-1 of ppbar collisions collected by the CDF II detector. Assuming a top-quark mass of 175 GeV/c^2, three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f_0) and right-handed (f_+) W bosons yields the model-independent results f_0 = 0.88 \pm 0.11 (stat) \pm 0.06 (syst) and f_+ = -0.15 \pm 0.07 (stat) \pm 0.06 (syst) with a correlation coefficient of -0.59. A measurement of f_0 (f_+) constraining f_+ (f_0) to its standard model value of 0.0 (0.7) yields f_0 = 0.70 \pm 0.07 (stat) \pm 0.04 (syst) (f_+ = -0.01 \pm 0.02 (stat) \pm 0.05 (syst)). All these results are consistent with standard model expectations.

Note:

submitted to Phys. Rev. Lett

13.85.Ni
14.70.Fm
14.65.Ha
13.85.Qk
OSG : CDF
top: decay
final state: ((n)jet lepton)
anti-p p: interaction
top: pair production
W: polarization

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