On hard exclusive reactions in the time-like region

Details On hard exclusive reactions in the time-like region On hard exclusive reactions in the time-like region

1996-11-15

arxiv.org/abs/hep-ph/9611338v1

Nucl.Phys.Proc.Suppl.56A:33-39,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk presented at the Fourth Biennal Conference on Low-Energy Antiproton Physics, LEAP96, Dinkelsb\"{u}hl (August 1996

Scientific paper

10.1016/S0920-5632(97)00249-1

The proton form factor, two-photon annihilations into $p\bar{p}$ as well as exclusive charmonium decays are critically examined. It will be argued that the standard perturbative QCD analysis of these reactions fails, i.e. the need for additional contributions can convincingly be demonstrated. Possible dynamical mechanisms such as colour-octet admixtures to the charmonium states or diquarks inside baryons, will be discussed and compared to the data.

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