Abstract
We investigate the momentum dependence of the extended Drell-Hearn-Gerasimov (DHG) sum rule. An economical formalism is developed which allows one to express the extended DHG sum rule in terms of a single virtual Compton amplitude in the 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 Δ(1232) intermediate states and relativistic corrections. We also discuss the limitations of our approach.
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 3062-3069 |
| Seitenumfang | 8 |
| Fachzeitschrift | Physical Review D |
| Jahrgang | 48 |
| Ausgabenummer | 7 |
| DOIs | |
| Publikationsstatus | Veröffentlicht - 1993 |