Δ(1232) resonance contribution to two-photon exchange in electron-proton scattering revisited

被引：0

作者：

Zhou, Hai-Qing ^{[1
]}

Yang, Shin Nan ^{[2
,3
]}

机构：

[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

[2] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[3] Natl Taiwan Univ, Ctr Theoret Sci, Taipei 10617, Taiwan

来源：

EUROPEAN PHYSICAL JOURNAL A | 2015年 / 51卷 / 08期

关键词：

FORM-FACTORS; RADIATIVE CORRECTIONS; AMPLITUDES; PHYSICS; RATIO; EP;

D O I：

10.1140/epja/i2015-15105-1

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 revisit the question of the contributions of the two-photon exchange with Delta(1232) excitation to the electron-proton scattering in a hadronic model. Three improvements over the previous calculations are made, namely, correct vertex function gamma N -> Delta, realistic gamma N Delta form factors, and coupling constants. The discrepancy between the values of R mu(p)G(E)/G(M) extracted from Rosenbluth technique and polarization transfer method can be reasonably accounted for if the data of Andivahis et al. (Phys. Rev. D 50, 5491 (1994)) are analyzed. However, substantial discrepancy remains if the data of Qattan et al. (nucl-ex/0610006) are used. For the ratio R perpendicular to between e perpendicular to p scatterings, our predictions appear to be in satisfactory agreement with the preliminary data from VEPP-3. The agreement between our model predictions and the recent measurements on single spin asymmetry, transverse and longitudinal recoil proton polarizations ranges from good to poor.

引用

页数：18

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