Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-22
PoS EPS-HEP2009 2009:070,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, Proceedings of EPS conference, Krakow, 16-22 July 2009
Scientific paper
Exclusive processes in hard electroproduction is one of the best place for understanding the factorization properties of QCD. The HERA experiment recently provided precise data for rho electroproduction, including all spin density matrix elements. From QCD, it is expected that such a process should factorize between a hard (calculable) coefficient function, and hadronic (p and rho) matrix elements. Such a factorization is up to now only proven for a longitudinaly polarized rho. Within the kt-factorization approach (valid at large s_{gamma* p}), we evaluate the impact factor of the transition gamma* -> rhoT taking into account the twist 3 contributions. We show that a gauge invariant expression is obtained with the help of QCD equations of motion. More generally, relying on these equations and on the invariance under rotation on the light-cone of the factorized amplitude, the non-perturbative Distribution Amplitudes can be reduced to a minimal set. This opens the way to a consistent treatment of factorization for exclusive processes with a transversally polarized vector meson. We prove the equivalence of two proposed parametrizations of the rhoT distribution amplitudes.
Anikin I. V.
Ivanov Dmitri Yu.
Pire Bernard
Szymanowski Lech
Wallon Samuel
No associations
LandOfFree
QCD factorization beyond leading twist in exclusive processes: rhoT-meson production does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with QCD factorization beyond leading twist in exclusive processes: rhoT-meson production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and QCD factorization beyond leading twist in exclusive processes: rhoT-meson production will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-301275