Deeply Virtual Compton Scattering on a Photon and Generalized Parton Distributions in the Photon
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We consider deeply virtual Compton scattering on a photon target, in the generalized Bjorken limit, at the Born order and in the leading logarithmic approximation.
We interpret the result as a factorized amplitude of a hard process described by handbag diagrams and anomalous generalized parton distributions in the photon.
This anomalous part, with its characteristic ln Q2 dependence, is present both in the DGLAP and in the ERBL regions. As a consequence, these generalized parton distributions of the photon obey DGLAP-ERBL evolution equations with an inhomogeneous term.
9 pages 3 figures. Version 2 to be published in Physics Letters B : more explanation and a few references added in the conclusion
9 pages 3 figures. Version 2 to be published in Physics Letters B : more explanation and a few references added in the conclusion