Small Momentum Evolution of the Extended Drell--Hearn--Gerasimov Sum Rule
High Energy Physics - Phenomenology
2016-08-14 v1 Nuclear Theory
Abstract
We investigate the momentum dependence of the extended Drell-Hearn-Gerasimov sum rule. An economical formalism is developed which allows to express the extended DHG sum rule in terms of a single virtual Compton amplitude in forward direction. Rigorous results for the small momentum evolution are derived from chiral perturbation theory within the one-loop approximation. Furthermore, we evaluate some higher order contributions arising from intermediate states and relativistic corrections. (2 figures available upon request).
Keywords
Cite
@article{arxiv.hep-ph/9212257,
title = {Small Momentum Evolution of the Extended Drell--Hearn--Gerasimov Sum Rule},
author = {Véronique Bernard and Norbert Kaiser and Ulf-G. Meißner},
journal= {arXiv preprint arXiv:hep-ph/9212257},
year = {2016}
}
Comments
12 pages, TeX, BUTP-92/51 and CRN-92-53