Deeply virtual Compton scattering at small x_B and the access to the GPD H
Abstract
We give a partonic interpretation for the deeply virtual Compton scattering (DVCS) measurements of the H1 and ZEUS collaborations in the small-x_B region in terms of generalized parton distributions. Thereby we have a closer look at the skewness effect, parameterization of the t-dependence, revealing the chromomagnetic pomeron, and at a model dependent access to the anomalous gravitomagnetic moment of nucleon. We also quantify the reparameterization of generalized parton distributions resulting from the inclusion of radiative corrections up to next-to-next-to-leading order. Beyond the leading order approximation, our findings are compatible with a `holographic' principle that would arise from a (broken) SO(2,1) symmetry. Utilizing our leading-order findings, we also perform a first model dependent dispersion relation fit of HERMES and JLAB DVCS measurements. From that we extract the generalized parton distribution H on its cross-over line and predict the beam charge-spin asymmetry, measurable at COMPASS.
Keywords
Cite
@article{arxiv.0904.0458,
title = {Deeply virtual Compton scattering at small x_B and the access to the GPD H},
author = {Kresimir Kumericki and Dieter Mueller},
journal= {arXiv preprint arXiv:0904.0458},
year = {2015}
}
Comments
LaTeX, 71 page, 15 figures, Sect. 5 improved, matches published version