Much of the predictive content of perturbative QCD (pQCD) treatment of the hadronic hard scattering is contained in factorization theorems [ 1]. Their purpose is to separate longfrom short-distance effects in scattering amplitudes. They supply perturbatively uncalculable long-distance effects with physics content in terms of well-defined matrix elements, which allows them to be measured experim...

The transverse component of the axial-vector correlation function quark fields is a natural starting object for lattice calculations twist-3 nucleon parton distribution functions. In this work we derive corresponding factorization expression in terms twist-2 and collinear distributions to one-loop accuracy. results are presented both position space, as theorem Ioffe-time distributions, momentum...

We describe the application of renormalization group improved perturbative QCD to inelastic lepton-hadron scattering at high center-of-mass energy but comparatively low photon virtuality. We construct a high energy factorization theorem which complements the mass factorization theorem used for processes with high virtualities. From it we derive a renormalization group equation which resums all ...