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Using approximately 4.3 million hadronic Z0 decays collected with the OPAL detector at LEP between 1990 and 1995, we measure the branching fractions of the Z0 into up-type and down-type light quarks, Rq, and the forwardbackward asymmetries, AFB(q), using high-momentum stable particles as a tag. Adopting a method that employs double tagged events to determine the flavour tagging efficiencies, and assuming the flavour independence of strong interactions and SU(2) isospin symmetry, we measure:

Measurement of the branching fractions and forward-backward asymmetries of the Z $^0$ into light quarks