Heavy quarks in deeply virtual Compton scattering

Abstract

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.

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

References in corpus (5)

• Generalized Parton Distributions
• Measurement of deeply virtual Compton scattering at HERA
• Measurement of D*+- production in deep inelastic ep scattering at HERA
• Measurement of $D^{\ast \pm }$ production in deep inelastic scattering at HERA
• A detailed QCD analysis of twist-3 effects in DVCS observables

Cited by in corpus (4)

• Unraveling hadron structure with generalized parton distributions
• Deeply virtual Compton scattering at small x_B and the access to the GPD H
• Next-to-leading-power kinematic corrections to DVCS: a scalar target
• Light-cone QCD sum rule approach for the $\Xi$ baryon electromagnetic form factors and the semileptonic decay Xi_c->Xi e^+nu_e