47,676 research outputs found
Nucleon hologram with exclusive leptoproduction
Hard exclusive leptoproductions of real photons, lepton pairs and mesons are
the most promising tools to unravel the three-dimensional picture of the
nucleon, which cannot be deduced from conventional inclusive processes like
deeply inelastic scattering.Comment: 9 pages LaTeX, 7 figures, sign in Eq. (16) corrected, Invited talk at
the European Workshop "QCD structure of the nucleon", Ferrara, Italy, April
3-6, 200
Spin effects in deeply virtual Compton scattering
We consider the azimuthal angle dependence in the cross section of the hard
leptoproduction of a photon on a nucleon target. We show that this dependence
allows to define observables that isolate the twist-two and twist-three sectors
in the deeply virtual Compton scattering amplitude. All twist-two and
twist-three Compton form factors can be extracted from measurements of the
charge odd part of the polarized cross section and give access to all
generalized parton distributions.Comment: 6 pages, LaTeX, 1 figure, Talk given at IX International Workshop on
Deep Inelastic Scattering Bologna, 27 April - 1 May 200
Radiative corrections to deeply virtual Compton scattering
We discuss possibilities of measurement of deeply virtual Compton scattering
amplitudes via different asymmetries in order to access the underlying skewed
parton distributions. Perturbative one-loop coefficient functions and two-loop
evolution kernels, calculated recently by a tentative use of residual conformal
symmetry of QCD, are used for a model dependent numerical estimation of
scattering amplitudes.Comment: 9 pages LaTeX, 3 figures, czjphyse.cls required Talk given by D.
M\"uller at Inter. Workshop ``PRAHA-Spin99'', Prague, Sept. 6-11, 199
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