Goloskokov, S. V. and Kroll, P. (2014) The pion pole in hard exclusive vector-meson leptoproduction. EUROPEAN PHYSICAL JOURNAL A, 50 (9): 146. ISSN 1434-6001, 1434-601X
Full text not available from this repository. (Request a copy)Abstract
Exploiting a set of generalized parton distributions (GPDs) derived from analyses of hard exclusive leptoproduction of rho(0), phi and pi(+) mesons, we investigate the omega spin density matrix elements (SDMEs) recently measured by the HERMES Collaboration. It turns out, from our study, that the pion pole is an important contribution to omega production. It will be treated as a one-particle exchange since its evaluation from the GPD (E) over tilde considerably underestimates its contribution. As an intermediate step of our analysis, we extract the pi omega transition form factor for photon virtualities less than 4 GeV2. From our approach we achieve results for the omega SDMEs in good agreement with the HERMES data. The role of the pion pole in exclusive rho(0) and phi leptoproduction is discussed too.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GENERALIZED PARTON DISTRIBUTIONS; FORM-FACTORS; LEPTON SCATTERING; OMEGA-MESONS; SUM-RULES; ELECTROPRODUCTION; QUARK; QCD; TRANSVERSITY; PROTON; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Aug 2019 11:59 |
| Last Modified: | 13 Aug 2019 11:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/9532 |
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