Publication
Title
Duality between different mechanisms of QCD factorization in $\gamma^{*}\gamma$ collisions
Author
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
Volume/pages
61:3(2009), p. 357-367
ISI
000266385100001
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Project info Publication type Subject