1999/05/21 by Jiri Chyla, Chyla, Jiri, Marek Tasevsky +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9905444
15 pages, Latex, 10 encapsulated eps figures. Three references updated, a few misprints corrected and several paragraphs slightly reworded. Contribution to the Workshop MC generators for HERA Physics
arxiv created 1999/06/29 · arxiv updated 2009/11/30
Interactions of virtual photons are analyzed in terms of photon structure. It is argued that the concept of parton distribution functions is phenomenologically very useful even for highly virtual photons involved in hard collisions. The role of longitudinal photons for proper interpretation of jet cross--sections in the region of moderate virtualities accessible at HERA is investigated.