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Title
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Measurement of W-boson polarization in top-quark decay in collisions at =1.96 TeV
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Author
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Institution/Organisation
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CDF Collaboration
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Abstract
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| We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb-1 of pp̅ 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. |
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Language
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English
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Source (journal)
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Physical review letters. - New York, N.Y., 1958, currens
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Publication
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New York, N.Y.
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American Physical Society
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2010
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ISSN
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0031-9007
[print]
1079-7114
[online]
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Volume/pages
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105
:4
(2010)
, p. 042002,1-042002,8
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ISI
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000280234400009
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Full text (Publisher's DOI)
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Full text (open access)
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