Complete one-loop electroweak radiative corrections to the cross section of the process e(+)e(-) -> -> mu(-) mu(+)(tau(-) tau(+)) are evaluated with the help of the SANC system. Higher-order contributions of the initial state radiation are computed in the QED structure function formalism. Numerical results are given for the center-of-mass energy range root s = 5, 7 GeV for various polarization degrees of the initial particles. This study is a contribution to the research program of the Super Charm-Tau Factory project being under development in Sarov, Russia.
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