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The processes of muons (tau) and charged pions pairs production atelectron-positron annihilation with first order radiative corrections areconsidered. The calculation results are presented assuming the energies offinal particles (cms implied) to be not far significantly from thresholdproduction. The invariant mass distributions for the muon (tau) and pion pairsare obtained both for the initial and final state radiation. Some analyticalcalculations are illustrated numerically. The pions were assumed to bepoint-like objects and scalar QED was applied for calculation. The QEDradiative corrections related to the final state radiation, additional to thewell known Coulomb factor, are treated near threshold region exactly.Comment: 18 pages, 9 eps pics, 2 feynmp diagrams, uses amsmath, graphicx,  feynmp, epsf, some references were adde

Cross sections of muon and charged pion pair production in electron-positron annihilation near the threshold