THE DRELL-HEARN-GERASIMOV SUM-RULE

被引：55

作者：

DRECHSEL, D

机构：

[1] Institut für Kernphysik, Universität Mainz

来源：

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 34: ELECTROMAGNETIC PROBES AND THE STRUCTURE OF HADRONS AND NUCLEI | 1995年 / 34卷

关键词：

PHOTOABSORPTION; SUM RULES; HELICITY; ASYMMETRIES; SPIN STRUCTURE; QUARK MODEL;

D O I：

10.1016/0146-6410(95)00014-A

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The Drell-Hearn-Gerasimov (DHG) sum rule relates the helicity structure of the photoabsorption cross section to the anomalous magnetic moment of the nucleon. It is based on Lorentz and gauge invariance, crossing symmetry, causality and unitarity. A generalized DHG sum rule my be derived for virtual photons. At low momentum transfer this generalized sum rule is saturated by the resonance region, at high momentum transfer it may be expressed by the parton spin distributions measured in deep inelastic scattering. The longitudinal-transverse interference determines the Cottingham sum rule, which is related to the elastic and magnetic form factors over the whole range of momentum tranfer.

引用

页码：181 / 200

页数：20

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