We summarize the lessons learned from studies of hard scattering processes in high–energy electron–proton collisions at HERA and antiproton–proton collisions at the Tevatron, with the aim of predicting new strong interaction phenomena observable in next–generation experiments at the Large Hadron Collider (LHC). Processes reviewed include inclusive deep–inelastic scattering (DIS) at small x, exc...

We show how the transverse polarization of a quark initiating a jet can be probed by the azimuthal distribution of two hadrons (of large z) in the jet. This permits a twist 2 asymmetry in hard processes when only one of the initial particles is polarized transversely. Applications to hadron-hadron and lepton-hadron scattering are discussed.

We discuss HERA data on the high energy behavior of the total γ∗p cross section and on diffraction in deep inelastic scattering. We outline their novelty in comparison with diffraction in high energy hadron hadron scattering. As a physical picture, we propose an interpretation in terms of QCD radiation at small and large distances: a careful study of the transition between the two extremes repr...

We introduce an eikonal Monte Carlo model (running in conjunction with HERWIG) for simulating multiparticle production in hadron-hadron interactions. We compare our simulated data to the CDF Tevatron measurement of the underlying event activity in hard inelastic proton-antiproton scattering at √ s=1.8 TeV. By fixing the only free parameter in our model, the total hadron-hadron cross section , w...

We show that the one-dimensional lattice model proposed by Lipatov to describe the high energy scattering of hadrons in multicolor QCD is completely integrable. We identify this model as the XXX Heisenberg chain of noncompact spin s = 0 and find the conservation laws of the model. A generalized Bethe ansatz is developed for the diagonalization of the hamiltonian and for the calculation of hadro...