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Дата последнего поиска статьи во внешних источниках: 11 сентября 2018 г.
Аннотация:We consider small--angle electron--positron scattering in Quantum Electrodynamics. Leading logarithmic contributions to the cross--section are explicitly calculated to three loop. Next--to--leading terms are exactly computed to two loop. All the radiative corrections due to photons as well as pair production are taken into account. The impact of newly evaluated next-to-leading and higher order leading corrections is discussed and numerical results are explicitly given. The results obtained are generally valid for high and low energy e+e− colliders. At LEP and SLC these results can be used to reduce the uncertainty on the cross--section below the per mille level.