Abstract
We calculate weak interaction corrections to R = σ( e + e − → all) σ( e + e − → μ +sm −) at high energies, using a quark parton model. We show that the correction due to interference between γ and Z mediated annihilations (which would make itself manifest by a variation linear in the square of the centre-of-mass energy) is strongly model dependent. In particular the γ-Z interference contribution to R vanishes identically (to the order g s 4 in the gluon coupling constant) in unified theories of weak, electromagnetic and strong interactions provided the lepton and quark masses are neglected as compared with the energy, and if perturbation theory is valid.
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