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arxiv: hep-ph/0207153 · v1 · submitted 2002-07-12 · ✦ hep-ph

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On "dual" parametrizations of generalized parton distributions

M.V. Polyakov , A.G. Shuvaev
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classification ✦ hep-ph
keywords generalizedpartondistributionsdistributiongpdsinfinitet-channelamplitudes
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We propose a parametrization for the generalized parton distributions (GPDs) which is based on representation of parton distributions as an infinite series of t-channel exchanges. The entire generalized parton distribution is given as an infinite sum over contributions of generalized light-cone distribution amplitudes in the t-channel. We also discuss the relations of the lowest Mellin moments of GPDs to basic mechanical characteristics of the nucleon as a compound system.

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  1. On the Two $R$-Factors in the Small-$x$ Shockwave Formalism

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    Replacing the rapidity argument of the dipole amplitude with ln min{1/|x|, 1/|ξ|} and refining initial conditions for non-linear evolution can eliminate two R-factors in small-x shockwave calculations.