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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/23571
Title: 
Measurement of the W boson helicity in top quark decays at D0
Author(s): 
Institution: 
  • Univ Buenos Aires
  • LAFEX
  • Universidade do Estado do Rio de Janeiro (UERJ)
  • Universidade Estadual Paulista (UNESP)
  • Univ Alberta
  • Simon Fraser Univ
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  • Korea University
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  • CINVESTAV
  • Univ Amsterdam
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  • 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
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  • University of Lancaster
  • Univ London Imperial Coll Sci Technol & Med
  • University of Manchester
  • University of Arizona
  • Univ Calif Berkeley
  • Lawrence Berkeley Lab
  • 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: 
1550-7998
Abstract: 
We present a measurement of the fraction f(+) of right-handed W bosons produced in top quark decays, based on a candidate sample of tt events in the l + jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb(-1) collected by the D0 detector at the Fermilab Tevatron pp Collider at root s = 1.96 TeV. We reconstruct the decay angle theta* for each lepton. By comparing the cos theta* distribution from the data with that for the expected background and signal for various values of f(+) (where we assume that the fraction of longitudinally-polarized W bosons has the standard model value of 0.70), we find f(+) = 0.056 +/- 0.080 (stat) +/- 0.057 (syst) (f(+) < 0.23 at 95% C. L.), consistent with the standard model prediction of f(+) = 3.6 X 10(-4).
Issue Date: 
1-Feb-2007
Citation: 
Physical Review D. College Pk: American Physical Soc, v. 75, n. 3, 8 p., 2007.
Time Duration: 
8
Publisher: 
American Physical Soc
Source: 
http://dx.doi.org/10.1103/PhysRevD.75.031102
URI: 
http://hdl.handle.net/11449/23571
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/23571
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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