5,146 research outputs found
Regge Asymptotics of Scattering with Flavour Exchange in QCD
The contribution to the perturbative Regge asymptotics of the exchange of two
reggeized fermions with opposite helicity is investigated. The methods of
conformal symmetry known for the case of gluon exchange are extended to this
case where double-logarithmic contributions dominate the asymptotics. The Regge
trajectories at large momentum transfer are calculated.Comment: 18 pages LATEX, 3 figures using package FEYNMAN, N3-9
QCD at high energies and Yangian symmetry
Yangian symmetric correlators provide a tool to investigate integrability
features of QCD at high energies. We discuss the kernel of the equation of
perturbative Regge asymptotics, the kernels of the evolution equation of parton
distributions, Born scattering amplitudes and coupling renormalization.Comment: 11 pages, contribution to ICNFP18, published versio
Electroproduction of vector mesons - factorization of end-point contributions
The end-point contributions in the quark longitudinal momentum fraction of
the virtual photon () to vector meson () impact factor to the
diffractive electroproduction amplitude can be factorized in terms of a
generalized parton evolution of the target parton distribution. The result is
used to model the helicity amplitudes in terms of small
generalized parton distributions.Comment: 24 pages LaTex, 4 eps-figure
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