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1.	Abazov, V. M., et al. (author) Model-independent measurement of the W-boson helicity in top-quark decays at D0 2008 In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 100:6 Journal article (peer-reviewed)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 (t) over bar events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron p (p) over bar 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 cos theta() 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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Author/Editor: Abbott, B. (1); Strandberg, Jonas (1); Ancu, L. S. (1); Andeen, T. (1); Begel, M. (1); Belanger-Champagne, ... (1); show more...; Borissov, G. (1); Brandt, A. (1); Brock, R. (1); Brooijmans, G. (1); Burdin, S. (1); Burke, S. (1); Butler, J. M. (1); Calfayan, P. (1); Calvet, S. (1); Chakraborty, D. (1); Cheu, E. (1); Coadou, Y. (1); Cooke, M. (1); Crepe-Renaudin, S. (1); De, K. (1); Deliot, F. (1); Denisov, S. P. (1); Duflot, L. (1); Enari, Y. (1); Evans, H. (1); Fiedler, F. (1); Filthaut, F. (1); Fox, H. (1); Garcia, C. (1); Gillberg, D. (1); Greenwood, Z. D. (1); Grohsjean, A. (1); Guo, J. (1); Gutierrez, P. (1); Haas, A. (1); Haefner, P. (1); Han, L. (1); Hauser, R. (1); Hensel, C. (1); Hohlfeld, M. (1); Hubacek, Z. (1); Jakobs, K. (1); Kaushik, V. (1); Kehoe, R. (1); Khanov, A. (1); Kuhl, T. (1); Kupco, A. (1); Kvita, J. (1); Lammers, S. (1); show less...

University: Royal Institute of Technology (1); Uppsala University (1); Stockholm University (1)

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