content_image/353925.jpg content_image/353926.jpg content_image/353927.jpg content_image/353928.jpg content_image/353929.jpg
us assume the power law small- x asymptotic behavior for the electric and magnetic gluon densities 

<img src='content_image/353925.jpg'>

For the forward like functions G ( E,M ) 0 ( x ) the power law behavior (62) results in 

<img src='content_image/353926.jpg'>

The contributions of the forward like functions G ( E,M ) 0 ( x ) into Im A g ( E,M ) have the following asymptotic behavior for ξ ∼ 0: 

<img src='content_image/353927.jpg'>

## VI. SKEWNESS EFFECT FOR SMALL ξ IN THE DUAL PARAMETRIZATION 

In this section we discuss some aspects of GPD modelling in the framework of the dual parametrization. The important characteristics of the particular GPD model is the so-called skewness effect (also known as the skewness ratio). In [13, 14] it was suggested to define the characteristics of the skewness effect for quark and gluon GPDs H q, g for t = 0 as ratios of the GPDs on the cross-over line x = ξ to the appropriate parton distribution functions, to which GPDs are reduced in the forward limit. Thus, for quark GPD H q the skewness ratio is defined according to 

while for gluon GPD H g it reads 

<img src='content_image/353928.jpg'>

<img src='content_image/353929.jpg'>

It is usually assumed that the small- ξ the asymptotic behavior of quark GPD on the cross over trajectory and the corresponding PDF is governed by the same leading Regge 

