Title
Measurement of the helicity fractions of **W** bosons from top quark decays using fully reconstructed <tex>$t\overline{t}$</tex> events with CDF II Measurement of the helicity fractions of **W** bosons from top quark decays using fully reconstructed <tex>$t\overline{t}$</tex> events with CDF II
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003
Volume/pages
75(2007) :5 , p. 052001,1-052001,11
ISSN
0556-2821
ISI
000245333000003
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We present a measurement of the fractions F0 and F+ of longitudinally polarized and right-handed W bosons in top-quark decays using data collected with the CDF II detector. The data set used in the analysis corresponds to an integrated luminosity of approximately 318  pb-1. We select tt&#773; candidate events with one lepton, at least four jets, and missing transverse energy. Our helicity measurement uses the decay angle θ*, which is defined as the angle between the momentum of the charged lepton in the W boson rest frame and the W momentum in the top-quark rest frame. The cos&#8289;θ* distribution in the data is determined by full kinematic reconstruction of the tt&#773; candidates. We find F0=0.85-0.22+0.15(stat)±0.06(syst) and F+=0.05-0.05+0.11(stat)±0.03(syst), which is consistent with the standard model prediction. We set an upper limit on the fraction of right-handed W bosons of F+<0.26 at the 95% confidence level.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/df3e6a/206e578c.pdf
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