QCD factorizations in gamma* gamma* -> rho rho

Details QCD factorizations in gamma* gamma* -> rho rho QCD factorizations in gamma* gamma* -> rho rho

2006-05-29

arxiv.org/abs/hep-ph/0605320v1

Phys.Lett.B639:642-651,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/j.physletb.2006.07.014

We calculate the lowest order QCD amplitude, i.e. the quark exchange contribution, to the forward production amplitude of a pair of longitudinally polarized $\rho$ mesons in the scattering of two virtual photons $\gamma^*(Q_1) \gamma^*(Q_2) \to \rho^0_L \rho^0_L$. We show that the scattering amplitude simultaneously factorizes in two quite different ways: the part with transverse photons is described by the QCD factorization formula involving the generalized distribution amplitude of two final $\rho$ mesons, whereas the part with longitudinally polarized photons takes the QCD factorized form with the $\gamma^*_L \to \rho^0_L$ transition distribution amplitude. Perturbative expressions for these, in general, non-perturbative functions are obtained in terms of the $\rho-$meson distribution amplitude.

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