Small momentum evolution of the extended Drell-Hearn-Gerasimov sum rule.
Small momentum evolution of the extended Drell-Hearn-Gerasimov sum rule.
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扩展的 Drell-Hearn-Gerasimov 和规则的小动量演化。
DOI:
10.1103/physrevd.48.3062
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发表时间:
1992
期刊:
影响因子:
--
通讯作者:
Meissner
中科院分区:
文献类型:
--
作者:
Bernard;Kaiser;Meissner
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 $\ensuremath{\Delta}(1232)$ intermediate states and relativistic corrections. We also discuss the limitations of our approach.