Search for scalar quarks in e+ee^{+} e^{-} collisions at s\sqrt{s} up to 209-GeV

Collaboration
Apr, 2002
21 pages
Published in:
  • Phys.Lett.B 537 (2002) 5-20
e-Print:
Report number:
  • CERN-EP-2002-026
Experiments:

Citations per year

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Abstract: (Elsevier)
Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP, at centre-of-mass energies up to 209 GeV, corresponding to an integrated luminosity of 675 pb −1 . No evidence for the production of such particles is found in the decay channels t ̃ → c / u χ , t ̃ → b ℓ ν ̃ , b ̃ → b χ , q ̃ → q χ or in the stop four-body decay channel t ̃ → b χ f f ̄ ′ studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/ c 2 is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios.
Note:
  • 17 pages, 6 figures Report-no: CERN-EP/2002-026
  • electron positron: colliding beams
  • electron positron: annihilation
  • squark: search for
  • squark: pair production
  • squark: decay modes
  • squark: top
  • squark: bottom
  • squark: branching ratio
  • supersymmetry
  • R parity: invariance