QCD factorizations in gamma* gamma* -> rho rho - Archive ouverte HAL
Article Dans Une Revue Physics Letters B Année : 2006

QCD factorizations in gamma* gamma* -> rho rho

Résumé

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.

Dates et versions

hal-00077403 , version 1 (30-05-2006)

Identifiants

Citer

B. Pire, M. Segond, L. Szymanowski, S. Wallon. QCD factorizations in gamma* gamma* -> rho rho. Physics Letters B, 2006, 639, pp.642-651. ⟨hal-00077403⟩
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