Duality between different mechanisms of QCD factorization in <script type="math/tex">\gamma^{*}\gamma</script> collisions

Anikin, I.V.; Cherednikov, I.O.; Stefanis, N.G.; Teryaev, O.V.

doi:10.1140/EPJC/S10052-009-1010-6

Title

Duality between different mechanisms of QCD factorization in $\gamma^{*}\gamma$ collisions

Author

Anikin, I.V.

Cherednikov, I.O.

Stefanis, N.G.

Teryaev, O.V.

Abstract

We study the phenomenon of duality in hard exclusive reactions to which QCD factorization applies. Considering "two-photon"-like processes in the scalar phi(3)(E) model and also two-hadron (pion) production from the collisions of a real (transversely polarized) and a highly-virtual, longitudinally polarized photon in QCD, we identify two regimes of factorization, each of them associated with a distinct non-perturbative mechanism. One mechanism involves twist-3 Generalized Distribution Amplitudes, whereas the other one employs leading-twist Transition Distribution Amplitudes. In the case of the scalar phi(3)(E) model, we find duality in that kinematical region where the two mechanisms overlap. In the QCD case, the appearance of duality is sensitive to the particular nonperturbative model applied and can, therefore, be used as an additional adjudicator.

Language

English

Source (journal)

European physical journal : C : particles and fields. - Berlin

Publication

Berlin : 2009

ISSN

1434-6044

1434-6052

DOI

10.1140/EPJC/S10052-009-1010-6

Volume/pages