(Quasi)elastic electron-muon large-angle scattering to a two-loop approximation: eikonal type contributions I

摘要

Part of eikonal type contributions to $e\mu$ large-angle high-energyscattering cross section is considered in a quasi-elastic experimental set-up.Apart from virtual corrections we examine inelastic processes with emission ofone and two soft real photons as well as soft lepton and pion pairs. Virtualphoton contributions are given within a logarithmic accuracy. Box type Feynmanamplitudes with leptonic and hadronic vacuum polarization insertion areconsidered explicitly as well as double box ones. Wherever appropriate analyticexpressions obtained are compared with those predicted by a structure functionapproach.