Freund, A. and Radyushkin, A. V. and Schaefer, A. and Weiss, C. (2003) Exclusive annihilation p(p)over-bar ->gamma gamma in a generalized parton picture. PHYSICAL REVIEW LETTERS, 90 (9): 092001. ISSN 0031-9007
Full text not available from this repository.Abstract
Exclusive proton-antiproton annihilation into two photons at large s (similar to10 GeV2) and \t\,\u\similar tos can be described by a generalized parton picture analogous to the "soft mechanism" in wide-angle real Compton scattering. The two photons are emitted in the annihilation of a single fast quark and antiquark. The matrix element describing the transition of the p (p) over bar system to a q (q) over bar pair can be related to the timelike proton elastic form factors as well as to the quark/antiquark distributions measured in inclusive deep-inelastic scattering. The reaction could be studied with the proposed 1.5-15 GeV high-luminosity antiproton storage ring (HESR) at GSI.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VIRTUAL COMPTON-SCATTERING; FORM-FACTORS; DOUBLE DISTRIBUTIONS; TWIST-3; AMPLITUDE; NUCLEON; REGION; QCD; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Aug 2021 10:16 |
| Last Modified: | 24 Aug 2021 10:16 |
| URI: | https://pred.uni-regensburg.de/id/eprint/39206 |
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