Cross section of the processes $e^{+}+e^{-}\to e^{+}+e^{-}(\gamma )$, $\to {\pi }^{+}+{\pi }^{-}(\gamma )$, ${\mu }^{+}+{\mu }^{-}(\gamma )$, $\gamma +\gamma (\gamma )$ in the energy region 200 MeV $\le 2E\le$ 3 GeV

E. A. Kuraev, A. I. Ahmadov, S. N. Panov +1

The cross section for different processes induced by $e^{+}{e}^{-}$ annihilation, in the kinematical limit ${\beta }_{\mu }\approx {\beta }_{\pi }=(1-m_{\pi }^2/{\epsilon }^2{)}^{1/2}\sim 1$, is calculated taking into account fi…