Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-04-28
Eur.Phys.J.A24:445-458,2005
Physics
High Energy Physics
High Energy Physics - Experiment
15 pages,19 figures
Scientific paper
10.1140/epja/i2005-10032-4
The exclusive omega electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q2) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross sections were measured up to large values of the four-momentum transfer (-t < 2.7 GeV2) to the proton. The contributions of the interference terms sigma_TT and sigma_TL to the cross sections, as well as an analysis of the omega spin density matrix, indicate that helicity is not conserved in this process. The t-channel pi0 exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction gamma* p -> omega p, even for Q2 as large as 5 GeV2. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross sections is nearly Q2-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.
collaboration CLAS
Morand L.
No associations
LandOfFree
Deeply virtual and exclusive electroproduction of omega mesons 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 Deeply virtual and exclusive electroproduction of omega mesons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deeply virtual and exclusive electroproduction of omega mesons will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-715277