Abstract
We discuss for the processe + e −→Z 0→q $$\bar q$$ how final state photons can be used to disentangle the weak couplings of up and down type quarks. Since the flavour composition of multihadronic events with final state photons is different from that of all multihadrons, a combination of observables from the two samples allows the couplings to be determined. Both theZ 0 width and the forward-backward charge asymmetry at centre-of-mass energies aroundM Z0 can be used to constrain the weak couplings. Taking into account the theoretical uncertainties a precision for the sum of the square axial and vector couplings of δ(v 2+a 2)∼4% for up and down type quarks separately seems feasible for 106 Z 0's. The precision from asymmetry measurements will be less significant.
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