Measurement of W-Boson Polarization in Top-quark Decay using the Full CDF Run II Data Set
High Energy Physics - Experiment
2013-03-18 v2
Abstract
We measure the polarization of W bosons from top-quark (t) decays into final states with a charged lepton and jets, tt --> WbWb --> lvbqqb, using the full Run II data set collected by the CDF II detector. A model-independent method simultaneously determines the fraction of longitudinal (f_0) and right-handed (f_+) W bosons to yield f_0 = 0.726 +/- 0.066 (stat) +/- 0.067 (syst) and f_+ = -0.045 +/- 0.044 (stat) +/- 0.058 (syst) with a correlation coefficient of -0.69. Additional results are presented under various standard model assumptions. No significant discrepencies with the standard model are observed.
Keywords
Cite
@article{arxiv.1211.4523,
title = {Measurement of W-Boson Polarization in Top-quark Decay using the Full CDF Run II Data Set},
author = {CDF Collaboration},
journal= {arXiv preprint arXiv:1211.4523},
year = {2013}
}
Comments
8 pages, 2 figures; as accepted to Phys. Rev. D Rapid Communications