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 Q².