Δ resonance contribution to two-photon exchange in electron-proton scattering -: art. no. 172503

被引：129

作者：

Kondratyuk, S ^{[1
]}

Blunden, PG

Melnitchouk, W

Tjon, JA

机构：

[1] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[2] Jefferson Lab, Newport News, VA 23606 USA

[3] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.95.172503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the effects on the elastic electron-proton scattering cross section of the two-photon exchange contribution with an intermediate Delta resonance. The Delta two-photon exchange contribution is found to be smaller in magnitude than the previously evaluated nucleon contribution, with an opposite sign at backward scattering angles. The sum of the nucleon and Delta two-photon exchange corrections has an angular dependence compatible with both the polarization-transfer and the Rosenbluth methods of measuring the nucleon electromagnetic form factors.

引用

页数：4

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