Diphoton Generalized Distribution Amplitudes

B. Pire; L. Szymanowski; M. El Beiyad; S. Wallon

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Diphoton Generalized Distribution Amplitudes

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arxiv 0806.1098 v1 pith:XKSEVDYP submitted 2008-06-06 hep-ph nucl-th

M. El Beiyad , B. Pire , L. Szymanowski , S. Wallon This is my paper

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keywords gammaamplitudedistributiongeneralizeddiphotonleadingorderphoton

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We calculate the leading order diphoton generalized distribution amplitude by calculating the amplitude of the process gamma* gamma -> gamma gamma in the low energy and high photon virtuality region at the Born order and in the leading logarithmic approximation. As in the case of the anomalous photon structure functions, the gamma gamma generalized distribution amplitude exhibits a characteristic \ln Q^2 behaviour and obeys inhomogeneous evolution equations.

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