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VOLUME 80 | ISSUE 11 | PAGE 806
High accuracy description of radiative return production of low-mass muon and pion pairs at e+e--colliders
A. B. Arbuzov, E. Bartos, V. V. Bytev, E. A. Kuraev, Z. K. Silagadze*
Joint Institute for Nuclear Research, 141980 Dubna, Russia
*Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia

PACS: 11.80.La, 12.20.Ds, 13.66.-a
The process of muon (pion) pair production with small invariant mass in electron--positron high--energy annihilation, accompanied by emission of a hard photon at large angles, is considered. We find that the Drell--Yan picture for the differential cross section is valid in the charge--even experimental set--up. Radiative corrections both for the electron block and for the final state block are taken into account.

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