engleski

GPD sum rules : A Tool to reveal the quark angular momentum

In deeply virtual exclusive electroproduction to leading order accuracy one accesses generalized parton distributions on their cross-over trajectory. Combining Lorentz covariance and analyticity leads to a family of GPD sum rules, guiding us to phenomenological concepts. As an example, we discuss the constraints from the JLAB/Hall A data on the GPD E. Its first Mellin moment is the anomalous gravitomagnetic moment, which is the unknown contribution to the quark angular momentum.

generalized parton distributions; deeply virtual Compton scattering; sum rules

Predavač: Dieter Müller. [arXiv:0807.0170 [hep-ph]] ; DOI: 10.3360/dis.2008.214