Hard diffractive electroproduction, transverse momentum distribution, and QCD vacuum structure

被引：17
作者：
Halperin, I
Zhitnitsky, A
机构：
[1] Physics and Astronomy Department, University of British Columbia, Vancouver, V6T 1Z1
来源：
PHYSICAL REVIEW D | 1997年 / 56卷 / 01期
关键词：
D O I：
10.1103/PhysRevD.56.184
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Wt study the impact of the ''intrinsic'' hadron transverse momentum on the pre-asymptotic behavior of the diffractive electroproduction of a longitudinally polarized rho meson. Surprisingly, we find the onset of the asymptotic regime in this problem to be rather low, Q(2) similar or equal to 10 GeV2 when power corrections due to the transverse momentum do not exceed 20% in the amplitude. This drastically contrasts with exclusive amplitudes where the asymptotics start much higher, Q(2) = 50-100 GeV2. The sources of such unexpected behavior are traced back to some general (the quark-hadron duality) as well as more silent (properties of higher dimensional vacuum condensates) features of QCD.
引用
收藏
页码：184 / 197
页数：14
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