CONTRIBUTIONS DUE TO THE LONGITUDINAL VIRTUAL PHOTON IN THE SEMI-INCLUSIVE ep COLLISION AT HERA

摘要

The importance of contributions due to the longitudinally polarised virtual photon, dσ_L and the interference term dτ_(LT), in the unpolarised ep collisions is discussed. The numerical calculations for the Compton process ep → eγX at the HERA collider were performed in the Born approximation. The various distributions in the CM_(ep) and Breit frames are presented. These cross sections are dominated by the transversely polarised intermediate photon, even for large Q~2.