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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/24471
Title: 
Model-independent measurement of the W-boson helicity in top-quark decays at D0
Author(s): 
Institution: 
  • Univ Buenos Aires
  • Centro Brasileiro de Pesquisas Físicas (CBPF)
  • Univ Estado Rio de Janiero
  • Universidade Federal do ABC (UFABC)
  • Universidade Estadual Paulista (UNESP)
  • Simon Fraser Univ
  • Univ Alberta
  • York Univ
  • McGill Univ
  • Univ Sci & Technol China
  • Universidad de los Andes
  • Charles Univ Prague
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  • Korea University
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  • CINVESTAV
  • FOM
  • Univ Amsterdam
  • Radboud Univ Nijmegen
  • Joint Inst Nucl Res
  • Institute for Theoretical and Experimental Physics (ITEP)
  • Moscow MV Lomonosov State Univ
  • Inst High Energy Phys
  • Petersburg Nucl Phys Inst
  • Lund Univ
  • Royal Inst Technol
  • Stockholm Univ
  • Uppsala Univ
  • Univ Zurich
  • University of Lancaster
  • Univ London Imperial Coll Sci Technol & Med
  • University of Manchester
  • University of Arizona
  • Univ Calif Berkeley
  • Calif State Univ Fresno
  • University of California, Riverside (UCR)
  • Florida State University
  • Fermilab Natl Accelerator Lab
  • Univ Illinois
  • No Illinois Univ
  • Northwestern University (NU)
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ISSN: 
0031-9007
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.
Issue Date: 
15-Feb-2008
Citation: 
Physical Review Letters. College Pk: Amer Physical Soc, v. 100, n. 6, p. 7, 2008.
Time Duration: 
7
Publisher: 
Amer Physical Soc
Source: 
http://dx.doi.org/10.1103/PhysRevLett.100.062004
URI: 
http://hdl.handle.net/11449/24471
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/24471
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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