General analysis of two-photon exchange in elastic electron-4He scattering and e+ + e- → π+ + π-

被引：5
|
作者：
Gakh, G. I. [1 ,2 ]
Tomasi-Gustafsson, E. [1 ]
机构：
[1] CEA Saclay, DSM IRFU SPhN, F-91191 Gif Sur Yvette, France
[2] Natl Sci Ctr Kharkov Inst Phys & Technol, UA-61108 Kharkov, Ukraine
来源：
NUCLEAR PHYSICS A | 2010年 / 838卷
关键词：
Elastic and Compton scattering; Electromagnetic processes and properties; Electromagnetic form factors; Polarization in interactions and scattering; RADIATIVE-CORRECTIONS; POLARIZATION PHENOMENA; AXIAL PARAMETRIZATION; CROSS-SECTION; HE-4; NUCLEUS;
D O I：
10.1016/j.nuclphysa.2010.03.005
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：
Using a general parametrization of the spin structure of the matrix element for the elastic e(-) + He-4 scattering and for the annihilation e(+) + e(-) -> pi(+) + pi(-) reactions in terms of two complex amplitudes, we derive general properties of the observables in presence of two-photon exchange. We show that this mechanism induces a specific dependence of the differential cross section on the angle of the emitted particle. We re-analyze the existing experimental data on the differential cross section, for elastic electron scattering on He-4, in the light of this result. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：50 / 60
页数：11
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