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Exclusive annihilation p pbar -> gamma gamma in a generalized parton picture | | A. Freund
; A.V. Radyushkin
; A. Schaefer
; C. Weiss
; | | Date: |
7 Aug 2002 | | Journal: | Phys.Rev.Lett. 90 (2003) 092001 | | Subject: | hep-ph | | Abstract: | Exclusive proton-antiproton annihilation into two photons at large s (~10 GeV^2) and |t|,|u| ~ s 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-pbar system to a q-qbar 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. | | Source: | arXiv, hep-ph/0208061 | | Services: | Forum | Review | PDF | Favorites | |
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