(Quasi)elastic large-angle electron-muon scattering in the two-loop approximation: Contributions of the eikonal type

A part of the eikonal-type contributions to the eμ large-angle high-energy scattering cross section is considered in a quasielastic experimental setup. In addition to virtual corrections, we examine inelastic processes with emission of one and two soft real photons and soft lepton and pion pairs. Virtual photon contributions are given within a logarithmic accuracy. Box-type Feynman amplitudes with leptonic and a hadronic vacuum polarization insertion and double-box ones are considered explicitly. Wherever appropriate, the analytic expressions obtained are compared with those predicted by the structure function approach.