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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/23603
Title: 
Direct observation of the strange b baryon Xi(-)(b)
Author(s): 
Institution: 
  • University of Michigan
  • Univ Buenos Aires
  • LAFEX
  • Universidade do Estado do Rio de Janeiro (UERJ)
  • Universidade Estadual Paulista (UNESP)
  • Simon Fraser Univ
  • Univ Alberta
  • York Univ
  • McGill Univ
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  • Universidad de los Andes
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  • Univ Aix Marseille 2
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  • FOM
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  • Joint Nucl Res Inst
  • Institute for Theoretical and Experimental Physics (ITEP)
  • Moscow MV Lomonosov State Univ
  • Inst High Energy Phys
  • Petersburg Nucl Phys Inst
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  • 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)
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  • Fermilab Natl Accelerator Lab
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  • University of Mississippi
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  • University of Rochester
  • SUNY Stony Brook
  • Brookhaven Natl Lab
  • Langston Univ
  • University of Oklahoma
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  • So Methodist Univ
  • Rice University
  • University of Virginia (UVA)
  • University of Washington
  • CEA Saclay
ISSN: 
0031-9007
Abstract: 
We report the first direct observation of the strange b baryon Xi(-)(b)(Xi) over bar (+)(b)). We reconstruct the decay Xi(-)(b)-->J/psi Xi(-), with J/psi-->mu(+)mu(-), and Xi(-)-->Lambda pi(-)-->p pi(-)pi(-) in p (p) over bar collisions at root s = 1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(-)(b) candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psi Lambda, we measure the relative rate sigma(Xi(-)(b))xB(Xi(-)(b)-->J/psi Xi)/ sigma(Lambda(b))xB(Lambda(b)-->J/psi Lambda) = 0.28 +/- 0.09(stat)(-0.08)(+0.09)(syst).
Issue Date: 
3-Aug-2007
Citation: 
Physical Review Letters. College Pk: Amer Physical Soc, v. 99, n. 5, 8 p., 2007.
Time Duration: 
8
Publisher: 
Amer Physical Soc
Source: 
http://dx.doi.org/10.1103/PhysRevLett.99.052001
URI: 
http://hdl.handle.net/11449/23603
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/23603
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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