Contribution of spin 1/2 and 3/2 resonances to two-photon exchange effects in elastic electron-proton scattering

被引：52
|
作者：
Kondratyuk, S. [1 ]
Blunden, P. G. [1 ]
机构：
[1] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada
来源：
PHYSICAL REVIEW C | 2007年 / 75卷 / 03期
关键词：
D O I：
10.1103/PhysRevC.75.038201
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 contributions of hadron resonances to two-photon exchange effects in electron-proton scattering. In addition to the nucleon and P33 resonance, the following heavier resonances are included as intermediate states in the two-photon exchange diagrams: D13,D33,P11,S11, and S31. We show that the corrections due to the heavier resonances are smaller than the dominant nucleon and P33 contributions. We also find that there is a partial cancellation between the contributions from the spin 1/2 and spin 3/2 resonances, which results in a further suppression of their aggregate two-photon exchange effect.
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页数：3
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