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HK: Physik der Hadronen und Kerne

HK 37: Elektromagnetische und Hadronische Proben

HK 37.8: Talk

Wednesday, March 9, 2005, 15:45–16:00, TU MA001

Timelike compton scattering and related exclusive processes in proton-antiproton annihilation at PANDA — •Michael Düren, Matthias Hartig, Björn Seitz, George Catalin Serbanut, and Hasko Stenzel — II. Physikalisches Institut, Uni Giessen, 35392 Giessen

Exclusive proton-antiproton annihilation into two photons at large s and t can be described in terms of the handbag diagram: The process is separated into a ’soft’ part (i.e. the formation of a single quark-antiquark pair) and a ’hard’ part (i.e. the subsequent annihilation into two photons). The latter can be treated in pertubative QCD. The process is of special interest due to its relation to the timelike formfactor and to Generalized Parton Distributions as measured in electron scattering experiments. It is proposed to measure this and related exclusive annihilation processes with a scalar meson, a vector meson or a lepton pair in the final state at the PANDA experiment at GSI.