Measurement of W-Boson Polarization in Top-Quark Decay in pp[over-bar] Collisions at [sqrt]s=1.96 TeV
Author(s)Bauer, Gerry P.; Paus, Christoph M. E.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, K.
Measurement of W-Boson Polarization in Top-Quark Decay in p(p)over-bar Collisions at root s=1.96 TeV
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
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.
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