(QUASI)ELASTIC LARGE-ANGLE ELECTRON-MUON SCATTERING IN THE TWO-LOOP APPROXIMATION: CONTRIBUTIONS OF THE EIKONAL TYPE
Bytev V.V., Kuraev E.A., Shaikhatdenov B.G.

Поступила в редакцию: 16 Сентября 2002

PACS: 11.80.-m, 13.10.+q, 13.65.+i

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A part of the eikonal-type contributions to the eμ large-angle high-energy scattering cross-section is considered in a quasi-elastic experimental set-up. 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.