The physics related to the form factors of the energy–momentum tensor spans a wide
spectrum of problems, and includes gravitational physics, hard-exclusive reactions, hadronic …

We give an overview of the theory for generalized parton distributions. Topics covered are
their general properties and physical interpretation, the possibility to explore the three …

The field of fragmentation functions of light quarks and gluons is reviewed. In addition to
integrated fragmentation functions, attention is paid to the dependence of fragmentation …

The generalized parton distributions, introduced nearly a decade ago, have emerged as a
universal tool to describe hadrons in terms of quark and gluonic degrees of freedom. They …

Recently, Brodsky, Hwang and Schmidt have proposed a new mechanism that gives a
transverse spin symmetry at leading twist in semi-inclusive deep-inelastic scattering. I show …

We systematically study dijet production in various processes in the small-x limit and
establish an effective kt-factorization for hard processes in a system with dilute probes …

Recent measurements from the HERMES and SMC Collaborations show a remarkably large
azimuthal single-spin asymmetries AUL and AUT of the proton in semi-inclusive pion …

Parton distributions contain factorizable final state interaction effects originating from the fast-
moving struck quark interacting with the target spectators in deeply inelastic scattering. We …

We analyze the transverse-momentum-dependent distribution and fragmentation functions
in space-like and time-like hard processes involving at least two hadrons, in particular, 1 …

We study generalized parton distributions in the impact parameter representation, including
the case of nonzero skewness ξ. Using Lorentz invariance, and expressing parton …