Two-photon-exchange correction to parity-violating elastic electron-proton scattering

被引：48

作者：

Afanasev, AV ^{[1
]}

Carlson, CE

机构：

[1] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[2] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 21期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.94.212301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Higher-order QED effects play an important role in precision measurements of nucleon elastic form factors in electron scattering. Here we introduce a two-photon-exchange QED correction to the parity-violating polarization asymmetry of elastic electron-proton scattering. We calculate this correction in the parton model using the formalism of generalized parton distributions, and demonstrate that it can reach several percent in certain kinematics, becoming comparable in size with existing experimental measurements of strange-quark effects in the proton neutral weak current.

引用

页数：4

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