FIZIKA B 8 (1999) 2, 371-374

DIQUARKS AS EFFECTIVE PARTICLES IN HARD EXCLUSIVE SCATTERING

CAROLA F. BERGER, BERNHARD LECHNER and WOLFGANG SCHWEIGER^a

Institute of Theoretical Physics, University of Graz, Universitätsplatz 5, A-8010 Graz, AUSTRIA
^ae-mail: wolfgang.schweiger@kfunigraz.ac.at

Received 14 January 1999; Accepted 7 June 1999

In the context of hard hadronic reactions diquarks are a useful phenomenological device to model non-perturbative effects still observable in the kinematic range accessible by present-day experiments. In the following we present diquark-model predictions for g g® pp  and LL. We also sketch how the (pure quark) hard-scattering formalism for exclusive reactions involving baryons can be reformulated in terms of quarks and diquarks. As an application of these considerations we analyze the magnetic proton form factor with regard to its quark-diquark content.

PACS numbers: 13.60.-r,13.40.Gp,12.38.Bx
UDC 539.126

Keywords: perturbative QCD, diquarks, hard hadronic processes, two-gamma reactions, proton magnetic form factor

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