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Model-Independent Measurement of the W-Boson Helicity in Top-Quark Decays at D0
Baringer, Philip S. Bean, Alice Hensel, Carsten Moulik, Tania Wilson, Graham Wallace Abazov, V. M. Abbott, B. Abolins, M. Acharya, B. S. Adams, M.
Baringer, Philip S.
Bean, Alice
Hensel, Carsten
Moulik, Tania
Wilson, Graham Wallace
Abazov, V. M.
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, M.
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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 tt-bar events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron pp-bar Collider. We reconstruct the angle θ* 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 cosθ* distribution finds that the fraction of longitudinal W bosons f(0)=0.425±0.166(stat)±0.102(syst) and the fraction of right-handed W bosons f(+)=0.119±0.090(stat)±0.053(syst), which is consistent at the 30% C.L. with the standard model.
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This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.100.062004.
Date
2008-02-14
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American Physical Society
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Baringer_2-14-2008.pdf
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V. M. Abazov et al. (D0 Collaboration). (2008). "Measurement of the tt-bar Production Cross Section in pp-bar Collisions at s√=1.96 TeV." Physical Review Letters, 100(6):062004. http://dx.doi.org/10.1103/PhysRevLett.100.062004.