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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/23573
Title: 
Evidence for production of single top quarks and first direct measurement of vertical bar V-tb vertical bar
Author(s): 
Institution: 
  • Joint Inst Nucl Res
  • Univ Buenos Aires
  • Centro Brasileiro de Pesquisas Físicas (CBPF)
  • Universidade do Estado do Rio de Janeiro (UERJ)
  • Universidade Estadual Paulista (UNESP)
  • Univ Alberta
  • Simon Fraser Univ
  • York Univ
  • McGill Univ
  • Univ Sci & Technol China
  • Universidad de los Andes
  • Charles Univ Prague
  • Czech Tech Univ Prague
  • Acad Sci Czech Republ
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  • Univ Clermont Ferrand
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  • Univ Aix Marseille 2
  • CNRS
  • Univ Paris 11
  • Univ Paris 06
  • Univ Paris 07
  • CEA Saclay
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  • Univ Haute Alsace
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  • Univ Wuppertal
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  • University of Delhi
  • Tata Inst Fundamental Res
  • Univ Coll Dublin
  • Korea University
  • Sungkyunkwan Univ
  • CINVESTAV
  • NIKHEF H
  • Univ Amsterdam
  • Radboud Univ Nijmegen
  • Institute for Theoretical and Experimental Physics (ITEP)
  • Moscow MV Lomonosov State Univ
  • Inst High Energy Phys
  • Petersburg Nucl Phys Inst
  • Royal Inst Technol
  • Lund Univ
  • Stockholm Univ
  • Uppsala Univ
  • Univ Zurich
  • University of Lancaster
  • Univ London Imperial Coll Sci & Technol
  • University of Manchester
  • University of Arizona
  • Univ Calif Berkeley
  • Lawrence Berkeley Natl 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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  • Univ Notre Dame
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  • Iowa State Univ
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ISSN: 
0031-9007
Abstract: 
The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron < p(p)over bar > collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(< p(p)over bar >-> tb+X,tqb+X)=4.9 +/- 1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68 <vertical bar V-tb vertical bar <= 1 at 95% C.L. within the standard model.
Issue Date: 
4-May-2007
Citation: 
Physical Review Letters. College Pk: American Physical Soc, v. 98, n. 18, 8 p., 2007.
Time Duration: 
8
Publisher: 
American Physical Soc
Source: 
http://dx.doi.org/10.1103/PhysRevLett.98.181802
URI: 
http://hdl.handle.net/11449/23573
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/23573
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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