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Measurement of W-Boson Polarization in Top-Quark Decay in pp[over-bar] Collisions at [sqrt]s=1.96 TeV

Author(s)
Paus, Christoph M. E.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Bauer, Gerry P; Makhoul, Khaldoun
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Alternative title
Measurement of W-Boson Polarization in Top-Quark Decay in p(p)over-bar Collisions at root s=1.96 TeV
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb[superscript -1] of pp[over-bar] collisions collected by the CDF II detector. Assuming a top-quark mass of 175  GeV/c[superscript 2], three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f0) and right-handed (f+) W bosons yields the model-independent results f0=0.88±0.11(stat)±0.06(syst) and f+=-0.15±0.07(stat)±0.06(syst) with a correlation coefficient of -0.59. A measurement of f0 [f+] constraining f+ [f0] to its standard model value of 0.0 [0.7] yields f0=0.70±0.07(stat)±0.04(syst) [f+=-0.01±0.02(stat)±0.05(syst)]. All these results are consistent with standard model expectations. We achieve the single most precise measurements of f0 for both the model-independent and model-dependent determinations.
Date issued
2010-07
URI
http://hdl.handle.net/1721.1/60405
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
CDF Collaboration et al. “Measurement of W-Boson Polarization in Top-Quark Decay in pp[over -bar] Collisions at sqrt[s]=1.96 TeV.” Physical Review Letters 105.4 (2010): 042002. © 2010 by The American Physical Society.
Version: Final published version
ISSN
0031-9007

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