Imaginary part of the electromagnetic lepton form factors
L. V. Avdeev, M. Yu. Kalmykov
Abstract
The charge F1(0) and the magnetic F2(0) form factors of heavy charged leptons have been shown in the framework of the perturbation theory to have imaginary part. The imaginary parts of the form factors for muon and tau lepton have been calculated at the two-loop level in the Standard Model. The effects where these imaginary parts could manifest themselves are discussed.
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