Heavy quarks in deeply virtual Compton scattering

Details Heavy quarks in deeply virtual Compton scattering Heavy quarks in deeply virtual Compton scattering

2003-12-10

arxiv.org/abs/hep-ph/0312137v2

Phys.Rev.D69:094016,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 12 eps-figures, LaTeX2e; (V2) include correct figure 3b, remove 'bottom' from figure caption 4

Scientific paper

10.1103/PhysRevD.69.094016

A detailed study of the heavy quark h=c,b,... contributions to deeply virtual Compton scattering is performed at both the amplitude and the cross section level, and their phenomenological relevance is discussed. For this purpose I calculate the lowest order off-forward photon-gluon scattering amplitude with a massive quark loop and the corresponding hard scattering coefficients. In a first numerical analysis these fixed order perturbation theory results are compared with the conventional intrinsic "massless" parton approach considering generalized parton distributions for the heavy quarks. The differences between these two prescriptions can be quite significant, especially at small skewedness where the massless approach largely overestimates the deeply virtual Compton scattering cross section.

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