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Abstract
We study Standard Model four-fermion production in e + e − annihilation at LEP2 energies and above using a semi-analytical approach. We derive the complete QED initial state corrections (ISR) to the reactions e +e − → (Z 0Z 0) → f 1 f 1f 2 f 2 and e +e − → (W +W − → f 1 u f 1 df 2 u f 2 d with f 1 ≠ f 2 and f i ≠ e −, →( W + W −). As compared to the well-known universal s-channel ISR, additional complexity arises due to non-universal, process-dependent ISR contributions from t and u-channel fermion exchanges. The formulae needed to perform numerical calculations are given together with samples of numerical results.
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