2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/201239The non-radiative scattering amplitudes for electron-positron annihilation into quark and lepton pairs in the TeV energy range are calculated in the double-logarithmic approximation. The expressions for the amplitudes are obtained using infrared evolution equations with different cut-offs for virtual photons and for W and Z bosons, and compared with previous results obtained with an universal cut-off.Revtex4, 17 pages, 7 figures. Some minor changes made, more refs addedHigh Energy Physics - Phenomenologytext