Journal article

Search for scalar top and scalar bottom quarks at LEP

G Abbiendi, C Ainsley, PF Akesson, G Alexander, J Allison, P Amaral, G Anagnostou, KJ Anderson, S Arcelli, S Asai, D Axen, G Azuelos, I Bailey, E Barberio, RJ Barlow, RJ Batley, P Bechtle, T Behnke, KW Bell, PJ Bell Show all

PHYSICS LETTERS B | ELSEVIER | Published : 2002

Abstract

Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 438 pb-1 at centre-of-mass energies of √s = 192-209 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level lower limit on the scalar top quark mass is 97.6 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. When the scalar top quark decouples from the Z0 boson, the lower limit is 95.7 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the li..

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