Diffractive exclusive photon production in DIS at DESY HERA

被引：81

作者：

Frankfurt, LL ^{[1
]}

Freund, A

Strikman, M

机构：

[1] Tel Aviv Univ, Dept Phys, IL-69978 Tel Aviv, Israel

[2] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

来源：

PHYSICAL REVIEW D | 1998年 / 58卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.58.114001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We demonstrate that perturbative QCD allows one to calculate the absolute cross section of diffractive exclusive production of photons at large Q(2) at DESY HERA, while the aligned jet model allows one to estimate the cross section for intermediate Q(2)similar to 2 GeV2. Furthermore, we find that the imaginary part of the amplitude for the production of real photons is larger than the imaginary part of the corresponding DIS amplitude by about a factor of 2, leading to the prediction of a significant counting rate for the current generation of experiments at HERA. We also find a large azimuthal angle asymmetry in ep scattering for HERA kinematics which allows one to directly measure the real part of the DVCS amplitude and hence the nondiagonal parton distributions. [S0556-2821(98)04417-8].

引用

页数：11

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