Exclusive annihilation p pbar -> gamma gamma in a generalized parton picture

Details Exclusive annihilation p pbar -> gamma gamma in a generalized parton picture Exclusive annihilation p pbar -> gamma gamma in a generalized parton picture

2002-08-06

arxiv.org/abs/hep-ph/0208061v1

Phys.Rev.Lett. 90 (2003) 092001

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, revtex4, 3 eps figures

Scientific paper

10.1103/PhysRevLett.90.092001

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.

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