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Inverse Radon transform at work
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The inverse Radon transform allows to obtain partonic double distributions from (extended) generalized parton distributions. We express the extension of generalized parton distributions by their dual parts, generalized distribution amplitudes and study some aspects of the filtered backprojection (inverse Radon transform). We also show that single integral transforms, previously obtained in the context of wave function overlap representation, are valid for generalized parton distributions that do not possess such a representation. Utilizing Radyushkin`s double distribution ansatz, we study and compare the numerical evaluation of double distributions within the filtered backprojection and single integral transforms along the imaginary and real axes.
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Inverse Radon transform and the transverse-momentum dependent functions
The paper's claimed new inverse-Radon contribution to T-odd parton distributions is a representation artifact, and its main Sivers-function relation is a tautology of the model ansatz.
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