Screened-Coulomb ansatz for the nonfactorizable radiative corrections to off-shell W+W- production

We demonstrate that the results of the complete first-order calculation of the nonfactorizable QED corrections to the single-inclusive cross sections for e(+)e(-) --> W+W- --> 4 fermions can be reproduced by a simple, physica lly motivated ansatz. The ansatz allows us to effectively take into account the screening role of the non-Coulomb radiative mechanisms by introducing a dampening factor in frost of the width-dependent part of the known first- order Coulomb correction! the so-called screened-Coulomb ansatz.