We discuss a selection of important recent H1 and ZEUS results on hadronic final states in deep-inelastic ep scattering at HERA.

Some of the new experimental results and theoretical developments presented at the Workshop on Deep Inelastic Scattering and Related Phenomena are reviewed.

Progress in the study of hadronic final states in deep inelastic scattering as well as pp̄, photoproduction and ee annihilation, as presented at the DIS97 workshop, is reviewed.

We show that a peripheral meson model can explain the large deep inelastic electron-proton scattering rapidity gap events observed at HERA. PACS numbers: 13.60.Hb, 14.40.-n

Isolated hard photons have been measured accompanied by jets in Deep Inelastic Scattering using the ZEUS detector at HERA. Preliminary results for the cross sections are presented.

The structure of the virtual photon and its contribution to small x processes in deep inelastic scattering at HERA is discussed.

High Q NC and CC cross sections as measured at HERA can give information on two distinct areas of current interest. Firstly, supposing that all the electroweak parameters are well known, these cross-sections may be used to give information on parton distribution functions (PDFs) in the new kinematic regime at high x and high Q. Secondly, supposing that PDFs are well known after evolution in Q f...

The diffractive open charm production is computed in perturbative QCD formalism and in the Regge approach. The results are compared with recent data on charm diffractive structure function measured at DESY-HERA. Our results demonstrate that this observable can be useful to discriminate the QCD dynamics.

We perform an analysis of semi-inclusive production of charm (D-mesons) in neutral current (NC) and charged current (CC) deep inelastic scattering (DIS) at full O(α s). Our calculation is based on the heavy quark scheme developed by Aivazis, Collins, Olness and Tung (ACOT) where we include anO(α s) calculation of quark scattering contributions for general masses and couplings. We review the rel...

We study the deep inelastic structure functions of mesons within the Nambu and JonaLasinio model. We calculate the valence quark distributions in π, K, and ρ mesons at the low energy model scale, which are evoluted to the experimental momentum scale in terms of the Altarelli-Parisi equation. The resulting distribution functions show reasonable agreements with experiment. We also discuss the sem...