Measurement of the Helicity Fractions of W Bosons from Top Quark Decays using Fully Reconstructed \boldmath${t\bar{t}}$ Events with CDF II - INSPIRE

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Measurement of the Helicity Fractions of W Bosons from Top Quark Decays using Fully Reconstructed \boldmath ${t\bar{t}}$ Events with CDF II

CDF

Collaboration

Dec, 2006

11 pages

Published in:

Phys.Rev.D 75 (2007) 052001

e-Print:

hep-ex/0612011 [hep-ex]

DOI:

10.1103/PhysRevD.75.052001

PDG:

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

Report number:

FERMILAB-PUB-06-461-E

Experiments:

FNAL-E-0830

View in:

reference search38 citations

Citations per year

Abstract: (arXiv)

We present a measurement of the fractions F_0 and F_+ of longitudinally polarized and right-handed W bosons in top quark decays using data collected with the CDF II detector. The data set used in the analysis corresponds to an integrated luminosity of approximately 318 pb -1. We select ttbar candidate events with one lepton, at least four jets, and missing transverse energy. Our helicity measurement uses the decay angle theta*, which is defined as the angle between the momentum of the charged lepton in the W boson rest frame and the W momentum in the top quark rest frame. The cos(theta*) distribution in the data is determined by full kinematic reconstruction of the ttbar candidates. We find F_0 = 0.85 +0.15 -0.22 (stat) +- 0.06 (syst) and F_+ = 0.05 +0.11 -0.05 (stat) +- 0.03 (syst), which is consistent with the standard model prediction. We set an upper limit on the fraction of right-handed W bosons of F_+ < 0.26 at the 95% confidence level.

Note:

11 pages, 2 figures, submitted to Phys. Rev. D

13.88.+e
12.15.-y
14.65.Ha
14.70.Fm
anti-p p: colliding beams
anti-p p: inclusive reaction
top: pair production
top: decay
final state: ((n)jet lepton)
W: helicity

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