Small momentum evolution of the extended Drell-Hearn-Gerasimov sum rule
- 1 October 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 48 (7) , 3062-3069
- https://doi.org/10.1103/physrevd.48.3062
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 $\Delta(1232)$ intermediate states and relativistic corrections. (2 figures available upon request)
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