# GPD sum rules: a tool to reveal the quark angular momentum

Source: [GPD sum rules: a tool to reveal the quark angular momentum](<https://www.sota2.com/research/paper/68fa219f7a2b558e29338386>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:52:16.075Z

Authors: K. Kumericki, D. Mueller, K. Passek-Kumericki

Published: 2008-07-01T14:39:50.000Z

## Abstract

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.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/0807.0170>)

[PDF](<https://arxiv.org/pdf/0807.0170.pdf>)