Process of muon (pion) pair production with small invariant mass in the electron-positron high-energy annihilation, accompanied by emission of hard photon at large angles, is considered. We find that the Dell-Yan picture for differential cross section is valid in the charge-even experimental set-up. Radiative corrections both for electron block and for final state block are taken into account.
@article{arxiv.hep-ph/0303083,
title = {Radiative muon (pion) pair production in high energy electron-positron annihilation process},
author = {A. B. Arbuzov and E. Bartos and V. V. Bytev and E. A. Kuraev},
journal= {arXiv preprint arXiv:hep-ph/0303083},
year = {2007}
}