The perturbative QCD predictions concerning deep inelastic scattering at low x are summarized. The theoretical framework based on the leading log 1/x resumma-tion and k t factorization theorem is described. The role of studying final states in deep inelastic scattering for revealing the details of the underlying dynamics at low x is emphasised and some dedicated measurements, like deep inelasti...

We estimate the cross-section and asymmetry relevant for the production of forward jets in polarised deep inelastic scattering in the region of small values of x which can be probed at possible polarised HERA measurements. The kinematical cuts implemented in our analysis are the same as those which were used in the unpolarised deep inelastic scattering at HERA. The calculations are based on the...

The general framework of diffractive deep inelastic scattering is introduced and reports given in the session on diffractive interactions at the International Workshop on Deep-Inelastic Scattering and Related Phenomena, Rome, April 1996, are presented.

Recent deep inelastic results from the H1 collaboration are presented. The topics covered include inclusive diffractive physics, the determination of αS using the event shapes, the study of the hadronic final state at low x with single particles and with jets, the structure function measurements in particular F p 2 at low Q and the high Q physics both in neutral and charged current.

In this paper we reconcile two contradictory statements about deep inelastic scattering (DIS) in manifestly covariant theories: (i) the scattering must be gauge invariant, even in the deep inelastic limit, and (ii) the pole term (which is not gauge invariant in a covariant theory) dominates the scattering amplitude in the deep inelastic limit. An “intermediate” answer is found to be true. We sh...

We demonstrate that the angular distribution of hadrons produced in semiinclusive deep inelastic final states is related to the inclusive longitudinal structure function. This relation could provide a new method of accessing FL(x,Q 2) in deep inelastic scattering measurements. The internal structure of the proton as probed in deep inelastic lepton-proton scattering can be parameterised in terms...

These lectures include an introduction to the partonic description of the proton, the photon and the ‘colour singlet’, as seen in inclusive and semi-inclusive DIS, in e+e− collisions, and in diffractive processes, respectively. Their formal treatment using structure, fragmentation, and fracture functions is outlined giving an insight into the perturbative QCD framework for these functions. Exam...