Deeply virtual Compton scattering at small x B and the access to the GPD H

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, reveali...

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Bibliographic Details
Published in:Nuclear physics. B 2010-12, Vol.841 (1), p.1-58
Main Authors: Kumerički, Krešimir, Müller, Dieter
Format: Article
Language:English
Subjects:
Deeply virtual Compton scattering
Generalized parton distributions
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Summary: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.
ISSN:0550-3213
1873-1562
DOI:10.1016/j.nuclphysb.2010.07.015