Two-photon exchange in a dispersion approach

被引：77

作者：

Borisyuk, Dmitry ^{[1
]}

Kobushkin, Alexander ^{[1
]}

机构：

[1] Bogolyubov Inst Theoret Phys, UA-03680 Kiev, Ukraine

来源：

PHYSICAL REVIEW C | 2008年 / 78卷 / 02期

关键词：

D O I：

10.1103/PhysRevC.78.025208

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：

We calculate the two-photon exchange amplitude for the elastic electron-proton scattering in the framework of dispersion relations. The imaginary part of the amplitude is determined by unitarity. Since in the unitarity relation intermediate states are on shell, off-shell form factors are not needed for the calculation. The real part is then evaluated using analytical properties of the amplitude. The expression for the elastic contribution to the amplitude, obtained in our approach, differs from the results of traditional calculations with on-shell form factors. Nevertheless, numerically the difference is minor for Q(2) up to 6 GeV2.

引用

页数：6

共 17 条

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