Title
Measurement of W-boson polarization in top-quark decay in <tex>$p\overline{p}$</tex> collisions at <tex>$\sqrt{s}$</tex>=1.96 TeV Measurement of W-boson polarization in top-quark decay in <tex>$p\overline{p}$</tex> collisions at <tex>$\sqrt{s}$</tex>=1.96 TeV
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
105(2010) :4 , p. 042002,1-042002,8
ISSN
0031-9007
ISI
000280234400009
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb-1 of pp&#773; collisions collected by the CDF II detector. Assuming a top-quark mass of 175  GeV/c2, 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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/e35ea4/cf91f2f9.pdf
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