Heidelberg 1999 – wissenschaftliches Programm

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T: Teilchenphysik

T 701: Post-deadline session 1

T 701.7: Vortrag

Freitag, 19. März 1999, 15:30–15:45, CH1

Hard multipion production and generalized distribution amplitudes — •M.V. Polyakov^1,2, C. Weiss², and K. Goeke² — ¹Petersburg Nuclear Physics Institute,188350, Gatchina, Russia — ²Institut für Theoretische Physik II, Ruhr-Univ. Bochum

Hard exclusive electroproduction of two or more pions is a process for which a systematic QCD description (factorization) is possible. One of the nonperturbative ingredients in the production amplitude is the light-cone distribution amplitude of the produced many pion state. We study in detail the properties of these generalized distribution amplitudes. This includes general properties following from chiral symmetry and dispersion relations, as well as quantitative estimates from model calculations based on the instanton vacuum.