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

By K. Kumerički, D. Mueller. 2009

163 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/7a4e53d0998e74b1568333fb3185fc77a56b3f52

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In Nuclear and High Energy Physics

Citations in the corpus

A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector (2012, methodology): “Alternatively, flexible SO(3)-based parameterisations have been used to determine GPDs from DVCS data [370].”