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Physical Review D

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Diphoton generalized distribution amplitudes

M. El Beiyad^1,2, B. Pire¹, L. Szymanowski^1,2,3, and S. Wallon²

¹Centre de Physique Théorique, École Polytechnique, CNRS, 91128 Palaiseau, France
²LPT, Université d’Orsay, CNRS, 91404 Orsay, France
³Soltan Institute for Nuclear Studies, Warsaw, Poland

Phys. Rev. D 78, 034009 – Published 13 August, 2008

DOI: https://doi.org/10.1103/PhysRevD.78.034009

Abstract

We calculate the leading order diphoton generalized distribution amplitudes by calculating the amplitude of the process $γ^{*} γ \to γ γ$ 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 $γ γ$ generalized distribution amplitudes exhibit a characteristic $\ln Q^{2}$ behavior and obey inhomogeneous QCD evolution equations.

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