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Model-independent measurement of the W boson helicity in top quark decays

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Model-independent measurement of the W boson helicity in top quark decays. / Collaboration, D0; M. Abazov, V.; Bertram, Iain et al.
In: Physical review letters, Vol. 100, No. 6, 062004, 14.02.2008.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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Collaboration D, M. Abazov V, Bertram I, Borissov G, Fox H, Love P et al. Model-independent measurement of the W boson helicity in top quark decays. Physical review letters. 2008 Feb 14;100(6):062004. doi: 10.1103/PhysRevLett.100.062004

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Collaboration, D0 ; M. Abazov, V. ; Bertram, Iain et al. / Model-independent measurement of the W boson helicity in top quark decays. In: Physical review letters. 2008 ; Vol. 100, No. 6.

Bibtex

@article{1fc096ab887d41fcaa49a548ee0b8e5c,
title = "Model-independent measurement of the W boson helicity in top quark decays",
abstract = "We present the first model-independent measurement of the helicity of $W$ bosons produced in top quark decays, based on a 1 fb$^{-1}$ sample of candidate $t\bar{t}$ events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron $p\bar{p}$ Collider. We reconstruct the angle $\theta^*$ between the momenta of the down-type fermion and the top quark in the $W$ boson rest frame for each top quark decay. A fit of the resulting \costheta distribution finds that the fraction of longitudinal $W$ bosons $f_0 = 0.425 \pm 0.166 \hbox{(stat.)} \pm 0.102 \hbox{(syst.)}$ and the fraction of right-handed $W$ bosons $f_+ = 0.119 \pm 0.090 \hbox{(stat.)} \pm 0.053 \hbox{(syst.)}$, which is consistent at the 30% C.L. with the standard model.",
author = "D0 Collaboration and {M. Abazov}, V. and Iain Bertram and Guennadi Borissov and Harald Fox and Peter Love and Alexander Rakitin and Peter Ratoff and Andre Sopczak and Mark Williams",
note = "{\textcopyright} 2008 The American Physical Society",
year = "2008",
month = feb,
day = "14",
doi = "10.1103/PhysRevLett.100.062004",
language = "English",
volume = "100",
journal = "Physical review letters",
issn = "1079-7114",
publisher = "American Physical Society",
number = "6",

}

RIS

TY - JOUR

T1 - Model-independent measurement of the W boson helicity in top quark decays

AU - Collaboration, D0

AU - M. Abazov, V.

AU - Bertram, Iain

AU - Borissov, Guennadi

AU - Fox, Harald

AU - Love, Peter

AU - Rakitin, Alexander

AU - Ratoff, Peter

AU - Sopczak, Andre

AU - Williams, Mark

N1 - © 2008 The American Physical Society

PY - 2008/2/14

Y1 - 2008/2/14

N2 - We present the first model-independent measurement of the helicity of $W$ bosons produced in top quark decays, based on a 1 fb$^{-1}$ sample of candidate $t\bar{t}$ events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron $p\bar{p}$ Collider. We reconstruct the angle $\theta^*$ between the momenta of the down-type fermion and the top quark in the $W$ boson rest frame for each top quark decay. A fit of the resulting \costheta distribution finds that the fraction of longitudinal $W$ bosons $f_0 = 0.425 \pm 0.166 \hbox{(stat.)} \pm 0.102 \hbox{(syst.)}$ and the fraction of right-handed $W$ bosons $f_+ = 0.119 \pm 0.090 \hbox{(stat.)} \pm 0.053 \hbox{(syst.)}$, which is consistent at the 30% C.L. with the standard model.

AB - We present the first model-independent measurement of the helicity of $W$ bosons produced in top quark decays, based on a 1 fb$^{-1}$ sample of candidate $t\bar{t}$ events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron $p\bar{p}$ Collider. We reconstruct the angle $\theta^*$ between the momenta of the down-type fermion and the top quark in the $W$ boson rest frame for each top quark decay. A fit of the resulting \costheta distribution finds that the fraction of longitudinal $W$ bosons $f_0 = 0.425 \pm 0.166 \hbox{(stat.)} \pm 0.102 \hbox{(syst.)}$ and the fraction of right-handed $W$ bosons $f_+ = 0.119 \pm 0.090 \hbox{(stat.)} \pm 0.053 \hbox{(syst.)}$, which is consistent at the 30% C.L. with the standard model.

U2 - 10.1103/PhysRevLett.100.062004

DO - 10.1103/PhysRevLett.100.062004

M3 - Journal article

VL - 100

JO - Physical review letters

JF - Physical review letters

SN - 1079-7114

IS - 6

M1 - 062004

ER -