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:
Physical review. D, Particles and fields
影响因子:
--
通讯作者:
Meissner
Meissner
中科院分区:
--
文献类型:
--
作者:
Bernard;Kaiser;Meissner

文献摘要

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我们研究了扩展的Drell-Hain-Gerasimov(DHG)求和规则的动量依赖性。发展了一种经济的形式,它允许人们用向前方向上的单个虚拟康普顿幅度来表示扩展的dhg和规则。在单圈近似下,用手征微扰理论得到了小动量演化的严格结果。此外,我们还评估了由中间态和相对论修正引起的一些高阶贡献。我们还讨论了我们方法的局限性。
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.